ARM: mediatek: enable the pin controller

This patch enables the pin controller for Mediatek SoCs.
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm/mach-mediatek/Kconfig

 menuconfig ARCH_MEDIATEK
 	bool "Mediatek MT65xx & MT81xx SoC" if ARCH_MULTI_V7
 	select ARM_GIC
+	select PINCTRL
 	select MTK_TIMER
 	help
 	  Support for Mediatek MT65xx & MT81xx SoCs