UPSTREAM: watchdog: gxp: Add missing MODULE_LICENSE

The build system says:

ERROR: modpost: missing MODULE_LICENSE() in drivers/watchdog/gxp-wdt.o

Add the missing MODULE_LICENSE.

Signed-off-by: Nick Hawkins <nick.hawkins@hpe.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/all/20220603131419.2948578-1-linux@roeck-us.net/


Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
(cherry picked from commit b6c8cd80)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I517f21913374a6608e07462a319a0e07297b4e46