saft: Modify ecbin size field on the DTB blob

The new updated ecbin may have a different size. The ecbin size field on the
DTB blob should be updated. Otherwise, the software sync may be failed.

BUG=chrome-os-partner:12997
TEST=After merging some EC update test changes, run:
run_remote_test.sh -a "new_ec=ec_autest_image.bin" firmware_UpdateECBin/control$

Change-Id: I9eebb3b4c885d8276d48650e78a7ca775280595d
Reviewed-on: https://gerrit.chromium.org/gerrit/31842
Commit-Ready: Tom Wai-Hong Tam <waihong@chromium.org>
Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org>
Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
1 file changed