media: fbdev: sh7760fb: convert to SPDX identifiers

This patch updates license to use SPDX-License-Identifier
instead of verbose license text.

As original license mentioned, it is GPL-2.0 in SPDX.
Then, MODULE_LICENSE() should be "GPL v2" instead of "GPL".
See ${LINUX}/include/linux/module.h

	"GPL"		[GNU Public License v2 or later]
	"GPL v2"	[GNU Public License v2]
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/video/fbdev/sh7760fb.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * SH7760/SH7763 LCDC Framebuffer driver.
  *
@@ -5,10 +6,6 @@
  *             Manuel Lauss <mano@roarinelk.homelinux.net>
  * (c) 2008 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
  *
- *  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.
- *
  * PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.txt!
  *
  * Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de>
@@ -587,4 +584,4 @@ module_platform_driver(sh7760_lcdc_driver);
 
 MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss");
 MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");