staging: octeon: add SPDX identifiers.

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 staging octeon driver 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/octeon/Makefile

+# SPDX-License-Identifier: GPL-2.0
 # This file is subject to the terms and conditions of the GNU General Public
 # License.  See the file "COPYING" in the main directory of this archive
 # for more details.

drivers/staging/octeon/ethernet-defines.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-mdio.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-mdio.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-mem.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-mem.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-rgmii.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-rx.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-rx.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-sgmii.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-spi.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-tx.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-tx.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet-util.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/ethernet.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *

drivers/staging/octeon/octeon-ethernet.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * This file is based on code from OCTEON SDK by Cavium Networks.
  *