treewide: Add SPDX license identifier for more missed files

Add SPDX license identifiers to all files which:

 - Have no license information of any form

 - Have MODULE_LICENCE("GPL*") inside which was used in the initial
   scan/conversion to ignore the file

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/char/agp/amd64-agp.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2001-2003 SuSE Labs.
  * Distributed under the GNU public license, v2.

drivers/char/agp/uninorth-agp.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * UniNorth AGPGART routines.
  */

drivers/char/agp/via-agp.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * VIA AGPGART routines.
  */

drivers/char/apm-emulation.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * bios-less APM driver for ARM Linux
  *  Jamey Hicks <jamey@crl.dec.com>

drivers/char/applicom.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* Derived from Applicom driver ac.c for SCO Unix                            */
 /* Ported by David Woodhouse, Axiom (Cambridge) Ltd.                         */
 /* dwmw2@infradead.org 30/8/98                                               */

drivers/char/ds1620.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
  *   thermometer driver (as used in the Rebel.com NetWinder)

drivers/char/dtlk.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*                                              -*- linux-c -*-
  * dtlk.c - DoubleTalk PC driver for Linux
  *

drivers/char/efirtc.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * EFI Time Services Driver for Linux
  *

drivers/char/hw_random/n2-drv.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* n2-drv.c: Niagara-2 RNG driver.
  *
  * Copyright (C) 2008, 2011 David S. Miller <davem@davemloft.net>

drivers/char/lp.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Generic parallel printer driver
  *

drivers/char/nsc_gpio.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* linux/drivers/char/nsc_gpio.c
 
    National Semiconductor common GPIO device-file/VFS methods.

drivers/char/nvram.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * CMOS/NV-RAM driver for Linux
  *

drivers/char/nwbutton.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * 	NetWinder Button Driver-
  *	Copyright (C) Alex Holden <alex@linuxhacker.org> 1998, 1999.

drivers/char/nwflash.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Flash memory interface rev.5 driver for the Intel
  * Flash chips used on the NetWinder.

drivers/char/pc8736x_gpio.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* linux/drivers/char/pc8736x_gpio.c
 
    National Semiconductor PC8736x GPIO driver.  Allows a user space

drivers/char/powernv-op-panel.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * OPAL Operator Panel Display Driver
  *

drivers/char/raw.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * linux/drivers/char/raw.c
  *

drivers/char/scx200_gpio.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* linux/drivers/char/scx200_gpio.c
 
    National Semiconductor SCx200 GPIO driver.  Allows a user space