ASoC: rt1308: Convert headers to SPDX

Convert include and source files to SPDX.
Signed-off-by: Shuming Fan <shumingf@realtek.com>
Link: https://lore.kernel.org/r/20190723101247.19741-1-shumingf@realtek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt1308.c

-/*
- * rt1308.c  --  RT1308 ALSA SoC amplifier component driver
- *
- * Copyright 2019 Realtek Semiconductor Corp.
- * Author: Derek Fang <derek.fang@realtek.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
+//
+// rt1308.c  --  RT1308 ALSA SoC amplifier component driver
+//
+// Copyright 2019 Realtek Semiconductor Corp.
+// Author: Derek Fang <derek.fang@realtek.com>
+//
 
 #include <linux/module.h>
 #include <linux/moduleparam.h>

sound/soc/codecs/rt1308.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
- * RT1308.h  --  RT1308 ALSA SoC amplifier component driver
+ * rt1308.h  --  RT1308 ALSA SoC amplifier component driver
  *
  * Copyright 2019 Realtek Semiconductor Corp.
  * Author: Derek Fang <derek.fang@realtek.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.
  */
 
 #ifndef _RT1308_H_