Use vboot for signing
Use vboot for signing

TEST=Ran it
BUG=chromium-os:18449
STATUS=Fixed

Change-Id: Ic09abe2b409f7da3b16eec0efb233063c9c5c178
Reviewed-on: http://gerrit.chromium.org/gerrit/5367
Tested-by: Kris Rambish <8a1e16570749310c5add42ae1efec654b4ce43a0@chromium.org>
Reviewed-by: Kris Rambish <8a1e16570749310c5add42ae1efec654b4ce43a0@chromium.org>
Reviewed-by: Nirnimesh <25e32f8a023b4789ee4f4636c1d5b28f8624cb3b@chromium.org>

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