google/kukui: Add MediaTek MT8183 reference board

BUG=b:80501386
BRANCH=none
TEST=timer and uart work fine

Change-Id: I08644892d34925574f791b000b0035d5afad7022
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/26722
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/kukui/Kconfig

@@ -0,0 +1,23 @@
+if BOARD_GOOGLE_KUKUI
+
+config VBOOT
+	select VBOOT_MOCK_SECDATA
+
+config BOARD_SPECIFIC_OPTIONS
+	def_bool y
+	select SOC_MEDIATEK_MT8183
+	select BOARD_ROMSIZE_KB_4096
+	select MAINBOARD_HAS_CHROMEOS
+	select COMMON_CBFS_SPI_WRAPPER
+	select SPI_FLASH
+	select FATAL_ASSERTS
+
+config MAINBOARD_DIR
+	string
+	default google/kukui
+
+config MAINBOARD_PART_NUMBER
+	string
+	default "Kukui"
+
+endif