coreboot: Add ram-code to DT under firmware/coreboot

CQ-DEPEND=CL:231132
BUG=chrome-os-partner:31728
BRANCH=none
TEST=Built and booted on pinky w/ coreboot patch and saw that
/proc/device-tree/firmware/coreboot/ram-code contains correct value

Signed-off-by: David Hendricks <dhendrix@chromium.org>
Change-Id: Iaa1751a03977fabc8a559a37e76d5236144ec19f
Reviewed-on: https://chromium-review.googlesource.com/231133
Reviewed-by: Julius Werner <jwerner@chromium.org>
1 file changed