arm64: mediatek: Add MT8173 SoC Kconfig and defconfig

Add MT8173 arm64 Kconfig and defconfig files
Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
Acked-by: Arnd Bergmann <arnd at arndb.de>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

arch/arm64/Kconfig

@@ -148,6 +148,12 @@ source "kernel/Kconfig.freezer"
 
 menu "Platform selection"
 
+config ARCH_MEDIATEK
+	bool "Mediatek MT65xx & MT81xx ARMv8 SoC"
+	select ARM_GIC
+	help
+	  Support for Mediatek MT65xx & MT81xx ARMv8 SoCs
+
 config ARCH_SEATTLE
 	bool "AMD Seattle SoC Family"
 	help

arch/arm64/configs/defconfig

@@ -32,6 +32,7 @@ CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 # CONFIG_BLK_DEV_BSG is not set
 # CONFIG_IOSCHED_DEADLINE is not set
+CONFIG_ARCH_MEDIATEK=y
 CONFIG_ARCH_THUNDER=y
 CONFIG_ARCH_VEXPRESS=y
 CONFIG_ARCH_XGENE=y
@@ -87,6 +88,7 @@ CONFIG_SERIO_AMBAKMI=y
 CONFIG_LEGACY_PTY_COUNT=16
 CONFIG_SERIAL_8250=y
 CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_MT6577=y
 CONFIG_SERIAL_AMBA_PL011=y
 CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
 CONFIG_SERIAL_OF_PLATFORM=y