BUG=chromium:595715
BRANCH=none
TEST=/build/$board/firmware/coreboot.rom has a zeroed out SHARED_DATA
region if it exists.
Change-Id: I0b59f1f0e2f8645000f83cb3ca7f49e4da726341
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://chromium-review.googlesource.com/417821
Commit-Ready: Patrick Georgi <pgeorgi@chromium.org>
Tested-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>