The gpio_keys driver is wrongly ARM-specific; it can't build on
other platforms with GPIO suport. This fixes that problem.
Signed-off-by: David Brownell
Cc: Dmitry Torokhov
Cc: pHilipp Zabel
Cc: Haavard Skinnemoen
Cc: Russell King
Cc: Richard Purdie
Cc: Ben Nizette
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds