Patch merged into coreboot/master: cbfstool: rename checksum to attributes_offset

the following patch was just integrated into master:
commit 0d618afc84db49e2248f9dff6ba21055830bc202
Author: Patrick Georgi 
Date:   Wed Jul 15 18:28:23 2015 +0200

cbfstool: rename checksum to attributes_offset

So far it's still unused, but its purpose will change:
    It will become an offset to another structure that contains additional file
    attributes.

This change is compatible because the binary format doesn't change and so far
    the field was always set to 0, which can serve nicely as 'unused' field.

Change-Id: I2dafb06866713d43a236556f9492641526270837
    Signed-off-by: Patrick Georgi 
    Reviewed-on: http://review.coreboot.org/10933
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin

See http://review.coreboot.org/10933 for details.

-gerrit