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/devs.c

@@ -1,14 +1,9 @@
-/* linux/arch/arm/plat-samsung/devs.c
- *
- * Copyright (c) 2011 Samsung Electronics Co., Ltd.
- *		http://www.samsung.com
- *
- * Base SAMSUNG platform device 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.
-*/
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2011 Samsung Electronics Co., Ltd.
+//		http://www.samsung.com
+//
+// Base SAMSUNG platform device definitions
 
 #include <linux/kernel.h>
 #include <linux/types.h>