fmap: Reduce RO_SECTION size to exclude RO_VPD area.

RO_SECTION is used for calculating a fixed "firmware hash" and also for firmware
updating (for early testing devices and protos), so it should not include RO_VPD
(which may be different for each device, and must be preserved when being
updated).

The region for all "write-protected" area is WP_RO, which contains both
RO_SECTION and WP_RO.

BUG=none
TEST=emerge-nyan depthcharge chromeos-bootimmage

Change-Id: I32bc29585d7eaa575befa5ecfff5fcb03b0b8de7
Reviewed-on: https://chromium-review.googlesource.com/186940
Reviewed-by: Gabe Black <gabeblack@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
4 files changed