google/*: Clean up Kconfg board selection for Google MTK boards
This patch tries to standardize and simplify the Kconfig option layout
for Google boards with MediaTek SoCs and align them to the scheme used
with other Arm-based Google boards.
Change-Id: I40880e7609ba703d0053ad01da742871e54d4e7a
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79063
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yidi Lin <yidilin@google.com>