ASoC: mx27vis-aic32x4: Switch to SPDX identifier

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

sound/soc/fsl/mx27vis-aic32x4.c

-/*
- * mx27vis-aic32x4.c
- *
- * Copyright 2011 Vista Silicon S.L.
- *
- * Author: Javier Martin <javier.martin@vista-silicon.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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- * MA 02110-1301, USA.
- */
+// SPDX-License-Identifier: GPL-2.0+
+//
+// mx27vis-aic32x4.c
+//
+// Copyright 2011 Vista Silicon S.L.
+//
+// Author: Javier Martin <javier.martin@vista-silicon.com>
 
 #include <linux/module.h>
 #include <linux/moduleparam.h>