ec/google: Add command to set APU SKU ID to EC

EC needs to have command to set SKU ID from APU to support
specific feature (ex: keyboard backlight) for variant board.

BUG=b:65359225
BRANCH=reef
TEST=emerge-snappy coreboot
Change-Id: I8cd3b8f646d4134d6bfff2869f6df2d9c615c157
Signed-off-by: Kevin Chiu <Kevin.Chiu@quantatw.com>
Reviewed-on: https://review.coreboot.org/21504
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
3 files changed