staging: mt7621-gpio: add SPDX identifier

It's good to have SPDX identifiers in driver files to make it easier to
audit the kernel tree for correct licenses.

Fix up the one of staging gpio-mt7621 file to have a proper SPDX
identifier, based on the license text in the file itself. The SPDX
identifier is a legally binding shorthand, which can be used instead of
the full boiler plate text.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-gpio/gpio-mt7621.c

+// SPDX-License-Identifier: GPL-2.0
 /*
- * 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.
- *
  * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  */