Without GENERIC_GPIO "struct gpio" is undefined leading to errors.
Reported-by: Randy Dunlap <rdunlap@xenotime.net> Acked-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>