staging: speakup: add SPDX identifier.

It's good to have SPDX identifiers in all files to make it easier to
audit the kernel tree for correct licenses.

Fix up the remaining staging speakup files to have a proper SPDX
identifier, based on the license text in the file itself.  The SPDX
identifier is a legally binding shorthand, which can be used instead of
the full boiler plate text.

This work is based on a script and data from Thomas Gleixner, Philippe
Ombredanne, and Kate Stewart.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Cc: William Hubbs <w.d.hubbs@gmail.com>
Cc: Chris Brannon <chris@the-brannons.com>
Cc: Kirk Reiser <kirk@reisers.ca>
Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/speakup/buffers.c

+// SPDX-License-Identifier: GPL-2.0
 #include <linux/console.h>
 #include <linux/types.h>
 #include <linux/wait.h>

drivers/staging/speakup/fakekey.c

+// SPDX-License-Identifier: GPL-2.0+
 /* fakekey.c
  * Functions for simulating keypresses.
  *

drivers/staging/speakup/keyhelp.c

+// SPDX-License-Identifier: GPL-2.0+
 /* speakup_keyhelp.c
  * help module for speakup
  *

drivers/staging/speakup/kobjects.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Speakup kobject implementation
  *

drivers/staging/speakup/main.c

+// SPDX-License-Identifier: GPL-2.0+
 /* speakup.c
  * review functions for the speakup screen review package.
  * originally written by: Kirk Reiser and Andy Berdan.

drivers/staging/speakup/serialio.c

+// SPDX-License-Identifier: GPL-2.0
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 

drivers/staging/speakup/speakup_acntpc.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_acntsa.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_apollo.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_audptr.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_bns.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_decext.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_decpc.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * This is the DECtalk PC speakup driver
  *

drivers/staging/speakup/speakup_dectlk.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_dtlk.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_dummy.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_keypc.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * written by David Borowski
  *

drivers/staging/speakup/speakup_ltlk.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_soft.c

+// SPDX-License-Identifier: GPL-2.0+
 /* speakup_soft.c - speakup driver to register and make available
  * a user space device for software synthesizers.  written by: Kirk
  * Reiser <kirk@braille.uwo.ca>

drivers/staging/speakup/speakup_spkout.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/speakup_txprt.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
  * this version considerably modified by David Borowski, david575@rogers.com

drivers/staging/speakup/spk_priv.h

+/* SPDX-License-Identifier: GPL-2.0+ */
 /* spk_priv.h
  * review functions for the speakup screen review package.
  * originally written by: Kirk Reiser and Andy Berdan.

drivers/staging/speakup/spk_priv_keyinfo.h

+/* SPDX-License-Identifier: GPL-2.0+ */
 /* spk_priv.h
  * review functions for the speakup screen review package.
  * originally written by: Kirk Reiser and Andy Berdan.

drivers/staging/speakup/spk_ttyio.c

+// SPDX-License-Identifier: GPL-2.0
 #include <linux/types.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>

drivers/staging/speakup/synth.c

+// SPDX-License-Identifier: GPL-2.0
 #include <linux/types.h>
 #include <linux/ctype.h>	/* for isdigit() and friends */
 #include <linux/fs.h>

drivers/staging/speakup/thread.c

+// SPDX-License-Identifier: GPL-2.0
 #include <linux/kthread.h>
 #include <linux/wait.h>
 

drivers/staging/speakup/varhandlers.c

+// SPDX-License-Identifier: GPL-2.0
 #include <linux/ctype.h>
 #include "spk_types.h"
 #include "spk_priv.h"