mb/google/fizz: Get OEM ID and SKU ID from EC

This patch makes coreboot fetch OEM ID and SKU ID from EC. If it fails,
it falls back to GPIO pins.

TEST=Verify AP log shows expected OEM ID and SKU ID on Fizz.

Change-Id: I06d3a205275b46660b3974bc3673d4be8e13f6d1
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://review.coreboot.org/23548
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
1 file changed