google/gru: add scarlet variant

There will be more follow-up changes.

BUG=chrome-os-partner:62377
BRANCH=None
TEST=emerge-scarlet coreboot libpayload

Change-Id: I9ca45598ff0ab12bf8063d16a86be564cf509390
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: a020a9ba1228b15599e202972df0096f58b1b31c
Original-Change-Id: I4804239483f8b35bc3703aa62c2a8fd642e0234a
Original-Signed-off-by: philipchen <philipchen@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/433039
Original-Commit-Ready: Philip Chen <philipchen@chromium.org>
Original-Tested-by: Philip Chen <philipchen@chromium.org>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/18296
Tested-by: build bot (Jenkins)
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>

src/mainboard/google/gru/Kconfig

@@ -86,6 +86,7 @@ config CONSOLE_SERIAL_UART_ADDRESS
 ##########################################################
 config MAINBOARD_PART_NUMBER
 	string
+	default "Scarlet" if BOARD_GOOGLE_SCARLET
 	default "Bob" if BOARD_GOOGLE_BOB
 	default "Gru" if BOARD_GOOGLE_GRU
 	default "Kevin" if BOARD_GOOGLE_KEVIN
@@ -93,6 +94,7 @@ config MAINBOARD_PART_NUMBER
 config GBB_HWID
 	string
 	depends on CHROMEOS
+	default "SCARLET TEST 7598" if BOARD_GOOGLE_SCARLET
 	default "BOB TEST 7422" if BOARD_GOOGLE_BOB
 	default "GRU TEST 5431" if BOARD_GOOGLE_GRU
 	default "KEVIN TEST 1422" if BOARD_GOOGLE_KEVIN

src/mainboard/google/gru/Kconfig.name

@@ -9,3 +9,8 @@ config BOARD_GOOGLE_GRU
 config BOARD_GOOGLE_BOB
 	bool "Bob"
 	select BOARD_GOOGLE_GRU_COMMON
+
+config BOARD_GOOGLE_SCARLET
+	bool "Scarlet"
+	select BOARD_GOOGLE_GRU_COMMON
+