memory: samsung: Add SPDX license identifiers

Replace GPL license statements with SPDX GPL-2.0 license identifiers.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

drivers/memory/samsung/Kconfig

+# SPDX-License-Identifier: GPL-2.0
 config SAMSUNG_MC
 	bool "Samsung Exynos Memory Controller support" if COMPILE_TEST
 	help

drivers/memory/samsung/Makefile

+# SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_EXYNOS_SROM)	+= exynos-srom.o

drivers/memory/samsung/exynos-srom.c

-/*
- * Copyright (c) 2015 Samsung Electronics Co., Ltd.
- *	      http://www.samsung.com/
- *
- * EXYNOS - SROM Controller support
- * Author: Pankaj Dubey <pankaj.dubey@samsung.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2015 Samsung Electronics Co., Ltd.
+//	      http://www.samsung.com/
+//
+// EXYNOS - SROM Controller support
+// Author: Pankaj Dubey <pankaj.dubey@samsung.com>
 
 #include <linux/io.h>
 #include <linux/init.h>

drivers/memory/samsung/exynos-srom.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (c) 2015 Samsung Electronics Co., Ltd.
  *		http://www.samsung.com
  *
  * Exynos SROMC register definitions
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
-*/
+ */
 
 #ifndef __EXYNOS_SROM_H
 #define __EXYNOS_SROM_H __FILE__