staging: wlan-ng: add SPDX identifiers to all wlan-ng driver files

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

Update the wlan-ng driver files with the correct SPDX license 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlan-ng/hfa384x.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* hfa384x.h
  *
  * Defines the constants and data structures for the hfa384x

drivers/staging/wlan-ng/hfa384x_usb.c

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* src/prism2/driver/hfa384x_usb.c
  *
  * Functions that talk to the USB variantof the Intersil hfa384x MAC

drivers/staging/wlan-ng/p80211conv.c

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* src/p80211/p80211conv.c
  *
  * Ether/802.11 conversions and packet buffer routines

drivers/staging/wlan-ng/p80211conv.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* p80211conv.h
  *
  * Ether/802.11 conversions and packet buffer routines

drivers/staging/wlan-ng/p80211hdr.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* p80211hdr.h
  *
  * Macros, types, and functions for handling 802.11 MAC headers

drivers/staging/wlan-ng/p80211ioctl.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* p80211ioctl.h
  *
  * Declares constants and types for the p80211 ioctls

drivers/staging/wlan-ng/p80211metadef.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* This file is GENERATED AUTOMATICALLY.  DO NOT EDIT OR MODIFY.
  * --------------------------------------------------------------------
  *

drivers/staging/wlan-ng/p80211metastruct.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* This file is GENERATED AUTOMATICALLY.  DO NOT EDIT OR MODIFY.
 * --------------------------------------------------------------------
 *

drivers/staging/wlan-ng/p80211mgmt.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* p80211mgmt.h
  *
  * Macros, types, and functions to handle 802.11 mgmt frames

drivers/staging/wlan-ng/p80211msg.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* p80211msg.h
  *
  * Macros, constants, types, and funcs for req and ind messages

drivers/staging/wlan-ng/p80211netdev.c

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* src/p80211/p80211knetdev.c
  *
  * Linux Kernel net device interface

drivers/staging/wlan-ng/p80211netdev.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* p80211netdev.h
  *
  * WLAN net device structure and functions

drivers/staging/wlan-ng/p80211req.c

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* src/p80211/p80211req.c
  *
  * Request/Indication/MacMgmt interface handling functions

drivers/staging/wlan-ng/p80211req.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* p80211req.h
  *
  * Request handling functions

drivers/staging/wlan-ng/p80211types.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /*
  * p80211types.h
  *

drivers/staging/wlan-ng/p80211wep.c

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* src/p80211/p80211wep.c
  *
  * WEP encode/decode for P80211.

drivers/staging/wlan-ng/prism2fw.c

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* from src/prism2/download/prism2dl.c
  *
  * utility for downloading prism2 images moved into kernelspace

drivers/staging/wlan-ng/prism2mgmt.c

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* src/prism2/driver/prism2mgmt.c
  *
  * Management request handler functions.

drivers/staging/wlan-ng/prism2mgmt.h

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* prism2mgmt.h
  *
  * Declares the mgmt command handler functions

drivers/staging/wlan-ng/prism2mib.c

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* src/prism2/driver/prism2mib.c
  *
  * Management request for mibset/mibget

drivers/staging/wlan-ng/prism2sta.c

+// SPDX-License-Identifier: (GPL-2.0 OR MPL-1.1)
 /* src/prism2/driver/prism2sta.c
  *
  * Implements the station functionality for prism2