arm64: mediatek: enable MTK_TIMER

Enable MTK_TIMER for MediaTek plaform, which will be used as
tick broadcast device and schedule clock.
Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/Kconfig.platforms

@@ -43,6 +43,7 @@ config ARCH_MEDIATEK
 	bool "Mediatek MT65xx & MT81xx ARMv8 SoC"
 	select ARM_GIC
 	select PINCTRL
+	select MTK_TIMER
 	help
 	  Support for Mediatek MT65xx & MT81xx ARMv8 SoCs