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/mtd/maps/amd76xrom.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * amd76xrom.c
  *

drivers/mtd/maps/ck804xrom.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * ck804xrom.c
  *

drivers/mtd/maps/esb2rom.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * esb2rom.c
  *

drivers/mtd/maps/ichxrom.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * ichxrom.c
  *

drivers/mtd/maps/ixp4xx.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * drivers/mtd/maps/ixp4xx.c
  *

drivers/mtd/maps/l440gx.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * BIOS Flash chip on Intel 440GX board.
  *

drivers/mtd/maps/map_funcs.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Out-of-line map I/O functions for simple maps when CONFIG_COMPLEX_MAPPINGS
  * is enabled.

drivers/mtd/maps/nettel.c

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

drivers/mtd/maps/sa1100-flash.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Flash memory access on SA11x0 based devices
  *

drivers/mtd/maps/scb2_flash.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * MTD map driver for BIOS Flash on Intel SCB2 boards
  * Copyright (C) 2002 Sun Microsystems, Inc.

drivers/mtd/maps/scx200_docflash.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* linux/drivers/mtd/maps/scx200_docflash.c
 
    Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>

drivers/mtd/maps/sun_uflash.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* sun_uflash.c - Driver for user-programmable flash on
  *                Sun Microsystems SME boardsets.
  *