ASoC: samsung: odroid: Convert to SPDX License Identifier

Replace GPL v2.0 license statements with SPDX license identifier.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/odroid.c

-/*
- * Copyright (C) 2017 Samsung Electronics Co., Ltd.
- *
- * 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) 2017 Samsung Electronics Co., Ltd.
 
 #include <linux/clk.h>
 #include <linux/clk-provider.h>