Updates to allow fw imaging to function properly as part of faft sequence.

Allows a tot test image to automatically update the ec/bios/kernel on a
system by recovering off of a servo-hosted usb key.

See embedded comments for specific hardware setup.

BUG=chromium-os:33448
TEST=run_remote_tests.sh --servo --args="image=... firmware_update=true"

Change-Id: Ie5de274f11b22f1581720e5eae3ceb57a7584c74
Reviewed-on: https://gerrit.chromium.org/gerrit/31322
Reviewed-by: Mike Truty <truty@chromium.org>
Tested-by: Mike Truty <truty@chromium.org>
Commit-Ready: Mike Truty <truty@chromium.org>
2 files changed