ARM: mediatek: Add regmap to mediatek Kconfig

Mediatek SoC needs the regmap/syscon infrastructure.
The infrastructure is used by the clock and pinctrl driver.
This patch adds MD_SYSCON to Kconfig for all Mediatek devices.

Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
diff --git a/arch/arm/mach-mediatek/Kconfig b/arch/arm/mach-mediatek/Kconfig
index 9f59e58..aeece17 100644
--- a/arch/arm/mach-mediatek/Kconfig
+++ b/arch/arm/mach-mediatek/Kconfig
@@ -3,6 +3,7 @@
 	select ARM_GIC
 	select PINCTRL
 	select MTK_TIMER
+	select MFD_SYSCON
 	help
 	  Support for Mediatek MT65xx & MT81xx SoCs