Check FMAP when updating firmware environment variables Environment variables are not always stored at the end of firmware image. Let's check for RW_ENVIRONMENT section in FMAP before updating environment variables. BUG=chrome-os-partner:9570 TEST=Successfully updated variables for x86 firmware image. Change-Id: Ifc8e3c4a7ded98ce8803f90a17bdfb9f07c9ff5e Reviewed-on: https://gerrit.chromium.org/gerrit/22199 Reviewed-by: Hung-Te Lin <[email protected]> Commit-Ready: Vic Yang <[email protected]> Tested-by: Vic Yang <[email protected]>