Add support for pdrw and pdrwhash blobs

This will be used by subsequent changes to pack the PD MCU firmware
into the BIOS firmware image.  For now, the new code path is not used.

BUG=chrome-os-partner:30079
BRANCH=none
TEST=Build samus firmware.
     Boot samus.  'crossystem mainfw_act' -> A
     As root, 'crossystem fwb_tries=1'
     Reboot samus.  'crossystem mainfw_act' -> B

Change-Id: I6dd31efc480acae7e8bf23f2a9e252b94be82c40
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/208898
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
2 files changed