mtd: rawnand: sh_flctl: 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>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

drivers/mtd/nand/raw/sh_flctl.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * SuperH FLCTL nand controller
  *
@@ -5,20 +6,6 @@
  * Copyright (c) 2008 Atom Create Engineering Co., Ltd.
  *
  * Based on fsl_elbc_nand.c, Copyright (c) 2006-2007 Freescale Semiconductor
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
- *
  */
 
 #include <linux/module.h>
@@ -1236,7 +1223,7 @@ static struct platform_driver flctl_driver = {
 
 module_platform_driver_probe(flctl_driver, flctl_probe);
 
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Yoshihiro Shimoda");
 MODULE_DESCRIPTION("SuperH FLCTL driver");
 MODULE_ALIAS("platform:sh_flctl");

include/linux/mtd/sh_flctl.h

-/*
+/* SPDX-License-Identifier: GPL-2.0
+ *
  * SuperH FLCTL nand controller
  *
  * Copyright © 2008 Renesas Solutions Corp.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #ifndef __SH_FLCTL_H__