regulator: pv880x0: Switch to SPDX identifier

Convert Powerventure Semiconductor PV88060/PV88080/PV88090 regulator
drivers to SPDX identifier.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/regulator/pv88090-regulator.c b/drivers/regulator/pv88090-regulator.c
index 90f4f90..b1d0d97 100644
--- a/drivers/regulator/pv88090-regulator.c
+++ b/drivers/regulator/pv88090-regulator.c
@@ -1,17 +1,7 @@
-/*
- * pv88090-regulator.c - Regulator device driver for PV88090
- * Copyright (C) 2015  Powerventure Semiconductor Ltd.
- *
- * 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.
- */
+// SPDX-License-Identifier: GPL-2.0+
+//
+// pv88090-regulator.c - Regulator device driver for PV88090
+// Copyright (C) 2015  Powerventure Semiconductor Ltd.
 
 #include <linux/err.h>
 #include <linux/i2c.h>