chromeos: Add code to read FMAP on ARM

On ARM the SPI flash is not memory mapped. Use the CBFS
interface to map the correct portion.

BRANCH=none
TEST=boot tested on pit
BUG=none

Change-Id: I8ea9aa0119e90a892bf777313fdc389c4739154e
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: https://chromium-review.googlesource.com/169781
Reviewed-by: David Hendrix <dhendrix@chromium.org>
1 file changed