vboot: Use "Google_" as VBOOT_FWID_MODEL prefix if CHROMEOS is set
CONFIG_MAINBOARD_VENDOR is customizable by OEM for Chrome OS
devices. However, VBOOT_FWID_MODEL indicates the firmware vendor and
hence if CHROMEOS is selected, then VBOOT_FWID_MODEL should always
prefix "Google_" instead of CONFIG_MAINBOARD_VENDOR.
BUG=b:
65493192
Change-Id: I0a2280bfd6d535586bc14d9a3c4a8198287f08bc
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/21458
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>