gooftool: improve flashrom writing speed.

Latest flashrom supports "--fast-verify" option which can improve writing speed.
Factory scripts should use it to optimize processing time.

BUG=none
TEST=time ./gft_clear_gbb_flags.sh
     # changed from 16s to 10s

Change-Id: I2db034ef63e2d60e7669a9c1ea45c94b9d8ef85f
Reviewed-on: https://gerrit.chromium.org/gerrit/14458
Reviewed-by: Yung-Chieh Lo <yjlou%chromium.org@gtempaccount.com>
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
2 files changed