[ARM] pxa: add GPIO support for pxa168

Signed-off-by: Eric Miao <eric.miao@marvell.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 5385d87..daf35d7 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -490,6 +490,8 @@
 config ARCH_MMP
 	bool "Marvell PXA168"
 	depends on MMU
+	select GENERIC_GPIO
+	select ARCH_REQUIRE_GPIOLIB
 	select HAVE_CLK
 	select COMMON_CLKDEV
 	select GENERIC_TIME