ASoC: ssm2602: switch to SPDX identifier

Drop old license header and switch to SPDX-License-Identifier.
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/ssm2602.c

-/*
- * File:         sound/soc/codecs/ssm2602.c
- * Author:       Cliff Cai <Cliff.Cai@analog.com>
- *
- * Created:      Tue June 06 2008
- * Description:  Driver for ssm2602 sound chip
- *
- * Modified:
- *               Copyright 2008 Analog Devices Inc.
- *
- * Bugs:         Enter bugs at http://blackfin.uclinux.org/
- *
- * 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, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
- */
+// SPDX-License-Identifier: GPL-2.0-or-later
+//
+// File:         sound/soc/codecs/ssm2602.c
+// Author:       Cliff Cai <Cliff.Cai@analog.com>
+//
+// Created:      Tue June 06 2008
+// Description:  Driver for ssm2602 sound chip
+//
+// Modified:
+//               Copyright 2008 Analog Devices Inc.
+//
+// Bugs:         Enter bugs at http://blackfin.uclinux.org/
 
 #include <linux/delay.h>
 #include <linux/module.h>