[ARM] Kirkwood: implement GPIO and GPIO interrupt support

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f1a3b10..d840a64 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -386,6 +386,7 @@
 	bool "Marvell Kirkwood"
 	select CPU_FEROCEON
 	select PCI
+	select GENERIC_GPIO
 	select GENERIC_TIME
 	select GENERIC_CLOCKEVENTS
 	select PLAT_ORION