pinctrl: bcm2835: Switch to SPDX identifier

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

Cc: Simon Arlott <[e-mail]>
Cc: Stephen Warren <[e-mail]>
Signed-off-by: Stefan Wahren <[e-mail]>
Reviewed-by: Eric Anholt <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/bcm/pinctrl-bcm2835.c

···
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Driver for Broadcom BCM2835 GPIO unit (pinctrl + GPIO)
  *
···
  * This driver is inspired by:
  * pinctrl-nomadik.c, please see original file for copyright information
  * pinctrl-tegra.c, please see original file for copyright information
- *
- * 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.
  */
 
 #include <linux/bitmap.h>

include/dt-bindings/pinctrl/bcm2835.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Header providing constants for bcm2835 pinctrl bindings.
  *
  * Copyright (C) 2015 Stefan Wahren <[e-mail]>
- *
- * The code contained herein is licensed under the GNU General Public
- * License. You may obtain a copy of the GNU General Public License
- * Version 2 at the following locations:
- *
- * http://www.opensource.org/licenses/gpl-license.html
- * http://www.gnu.org/copyleft/gpl.html
  */
 
 #ifndef __DT_BINDINGS_PINCTRL_BCM2835_H__