ASoC: imx-mc13783: Switch to SPDX identifier

Adopt the SPDX license identifier headers to ease license compliance
management.
Signed-off-by: Andra Danciu <andradanciu1997@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/imx-mc13783.c

-/*
- * imx-mc13783.c  --  SoC audio for imx based boards with mc13783 codec
- *
- * Copyright 2012 Philippe Retornaz, <philippe.retornaz@epfl.ch>
- *
- * Heavly based on phycore-mc13783:
- * Copyright 2009 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
- *
- *  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+
+//
+// imx-mc13783.c  --  SoC audio for imx based boards with mc13783 codec
+//
+// Copyright 2012 Philippe Retornaz, <philippe.retornaz@epfl.ch>
+//
+// Heavly based on phycore-mc13783:
+// Copyright 2009 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
 
 #include <linux/module.h>
 #include <linux/moduleparam.h>