regulator: da9xxx: Switch to SPDX identifier

Convert Dialog Semiconductor DA9xxx 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/da903x.c b/drivers/regulator/da903x.c
index 33e8f3b..5493c3a 100644
--- a/drivers/regulator/da903x.c
+++ b/drivers/regulator/da903x.c
@@ -1,13 +1,9 @@
-/*
- * Regulators driver for Dialog Semiconductor DA903x
- *
- * Copyright (C) 2006-2008 Marvell International Ltd.
- * Copyright (C) 2008 Compulab Ltd.
- *
- * 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.
- */
+// SPDX-License-Identifier: GPL-2.0
+//
+// Regulators driver for Dialog Semiconductor DA903x
+//
+// Copyright (C) 2006-2008 Marvell International Ltd.
+// Copyright (C) 2008 Compulab Ltd.
 
 #include <linux/kernel.h>
 #include <linux/init.h>