ASoC: tfa9879: switch to SPDX license tag

It's less overhead, clearer and generally neater.
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/tfa9879.c

-/*
- * tfa9879.c  --  driver for NXP Semiconductors TFA9879
- *
- * Copyright (C) 2014 Axentia Technologies AB
- * Author: Peter Rosin <peda@axentia.se>
- *
- *  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+
+//
+// tfa9879.c  --  driver for NXP Semiconductors TFA9879
+//
+// Copyright (C) 2014 Axentia Technologies AB
+// Author: Peter Rosin <peda@axentia.se>
 
 #include <linux/module.h>
 #include <linux/init.h>

sound/soc/codecs/tfa9879.h

+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * tfa9879.h  --  driver for NXP Semiconductors TFA9879
  *
  * Copyright (C) 2014 Axentia Technologies AB
  * Author: Peter Rosin <peda@axentia.se>
- *
- *  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.
- *
  */
 
 #ifndef _TFA9879_H