regulator: sky81452: Switch to SPDX identifier

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/sky81452-regulator.c

-/*
- * sky81452-regulator.c	SKY81452 regulator driver
- *
- * Copyright 2014 Skyworks Solutions Inc.
- * Author : Gyungoh Yoo <jack.yoo@skyworksinc.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.
- *
- * 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 <http://www.gnu.org/licenses/>.
- */
+// SPDX-License-Identifier: GPL-2.0
+//
+// sky81452-regulator.c	SKY81452 regulator driver
+//
+// Copyright 2014 Skyworks Solutions Inc.
+// Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
 
 #include <linux/module.h>
 #include <linux/kernel.h>