arm64: mediatek: Select PINCTRL for Mediatek platform

MediaTek SoC expect to work with a pinctrl driver.
Select PINCTRL if ARCH_MEDIATEK is selected.
Signed-off-by: NYingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: NMatthias Brugger <matthias.bgg@gmail.com>

arch/arm64/Kconfig

@@ -174,6 +174,7 @@ config ARCH_FSL_LS2085A
 config ARCH_MEDIATEK
 	bool "Mediatek MT65xx & MT81xx ARMv8 SoC"
 	select ARM_GIC
+	select PINCTRL
 	help
 	  Support for Mediatek MT65xx & MT81xx ARMv8 SoCs