cheza: Add board ID, RAM code and SKU ID

This patch adds the required callbacks to read all strapping IDs on
Cheza.

Change-Id: I6437bbd03bdd00dfeedcafebabeb00b13588d052
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/27789
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
2 files changed