drivers: gpio: amd8111: use SPDX-License-Identifier

Prefer SPDX-License-Identifier over hand-written texts.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Link: https://lore.kernel.org/r/20201203182423.5499-3-info@metux.netSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-amd8111.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * GPIO driver for AMD 8111 south bridges
  *
@@ -20,10 +21,6 @@
  * Hardware driver for Intel i810 Random Number Generator (RNG)
  * Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>
  * Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>
- *
- * This file is licensed under  the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
  */
 #include <linux/ioport.h>
 #include <linux/module.h>