ASoC: samsung: smartq_wm8987: Convert to SPDX License Identifier

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

sound/soc/samsung/smartq_wm8987.c

-/* sound/soc/samsung/smartq_wm8987.c
- *
- * Copyright 2010 Maurus Cuelenaere <mcuelenaere@gmail.com>
- *
- * Based on smdk6410_wm8987.c
- *     Copyright 2007 Wolfson Microelectronics PLC. - linux@wolfsonmicro.com
- *     Graeme Gregory - graeme.gregory@wolfsonmicro.com
- *
- *  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;  either version 2 of the  License, or (at your
- *  option) any later version.
- *
- */
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright 2010 Maurus Cuelenaere <mcuelenaere@gmail.com>
+//
+// Based on smdk6410_wm8987.c
+//     Copyright 2007 Wolfson Microelectronics PLC. - linux@wolfsonmicro.com
+//     Graeme Gregory - graeme.gregory@wolfsonmicro.com
 
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>