Instead of treating offsets relative to after the header make the offsets relative to the in-memory mirror buffer. This simplifies the logic in that all offsets are treated the same. It also allows one to remove a global variable. BUG=chrome-os-partner:55932 Change-Id: I42491e05755d414562b02b6f9ae47f5c357d2f8a Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/16098 Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh <furquan@google.com> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>