EC software sync uses precomputed hash if available

This removes the need to load the EC code at all when the precomputed
hash matches.

BUG=chrome-os-partner:17606
BRANCH=spring
TEST=wouldn't that be nice

Change-Id: If4438b9db8b1449b8fd4d90ef3acb3bbec5e09a0
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/42567
4 files changed