mb/google/kukui: Add default HWID for Chrome OS

The default value for Chrome OS HWID should be different.
Calculated as HWID v1.

BUG=b:123336677
BRANCH=kukui
TEST=build and boots properly.

Change-Id: I39c640562c1c3b117292b8abacd36a4a9c2fa6c6
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/c/31088
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: You-Cheng Syu <youcheng@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/mainboard/google/kukui/Kconfig

@@ -59,4 +59,10 @@ config EC_GOOGLE_CHROMEEC_SPI_BUS
 	hex
 	default 0x2
 
+config GBB_HWID
+	string
+	depends on CHROMEOS
+	default "KUKUI TEST 9847" if BOARD_GOOGLE_KUKUI
+	default "FLAPJACK TEST 4147" if BOARD_GOOGLE_FLAPJACK
+
 endif