Patch merged into coreboot/master: commonlib: Add function to hash contents of a CBFS region.

the following patch was just integrated into master:
commit cbb6c75061c5435f115629b1546e21157de3d194
Author: Aaron Durbin 
Date:   Tue Dec 15 15:57:11 2015 -0600

commonlib: Add function to hash contents of a CBFS region.

Provide a common routine to hash the contents of a cbfs
    region. The cbfs region is hashed in the following order:
    1. potential cbfs header at offset 0
    2. potential cbfs header retlative offset at cbfs size - 4
    3. For each file the metadata of the file.
    4. For each non-empty file the data of the file.

BUG=chrome-os-partner:48412
    BUG=chromium:445938
    BRANCH=None
    TEST=Utilized in chromeos cros_bundle_firmware as well as at
          runtime during vboot verification on glados.

Change-Id: Ie1e5db5b8a80d9465e88d3f69f5367d887bdf73f
    Signed-off-by: Aaron Durbin 
    Reviewed-on: https://review.coreboot.org/12786
    Reviewed-by: Patrick Georgi 
    Tested-by: build bot (Jenkins)

See https://review.coreboot.org/12786 for details.

-gerrit