soc: bcm: Switch raspberrypi-power to SPDX identifier

Adopt the SPDX license identifier headers to ease license compliance
management.

Cc: Alexander Aring <aring@mojatatu.com>
Cc: Eric Anholt <eric@anholt.net>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

drivers/soc/bcm/raspberrypi-power.c

+// SPDX-License-Identifier: GPL-2.0
 /* (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
- *
- * 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.
  *
  * Authors:
  * Alexander Aring <aar@pengutronix.de>

include/dt-bindings/power/raspberrypi-power.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  *  Copyright © 2015 Broadcom
- *
- * 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.
  */
 
 #ifndef _DT_BINDINGS_ARM_BCM2835_RPI_POWER_H