ARM: SAMSUNG: Add SPDX license identifiers

Replace GPL license statements with SPDX license identifiers (GPL-1.0+,
GPL-2.0 and GPL-2.0+).

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/plat-samsung/platformdata.c

@@ -1,13 +1,8 @@
-/* linux/arch/arm/plat-samsung/platformdata.c
- *
- * Copyright 2010 Ben Dooks <ben-linux <at> fluff.org>
- *
- * Helper for platform data setting
- *
- * 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 2010 Ben Dooks <ben-linux <at> fluff.org>
+//
+// Helper for platform data setting
 
 #include <linux/kernel.h>
 #include <linux/slab.h>