faft: Move UpdateECBin test to a separated suite faft_update_ec

As discussed, UpdateECBin requires an additional new_ec argument which is
not required in normal BIOS FAFT suites. Moving it to a separated suite
faft_update_ec makes more sense, like the BIOS update tests in faft_update
suite.

BUG=chrome-os-partner:12997
TEST=None, trivial change.

Change-Id: Id7c1eaaefc971307c5706548d016acc37f8c9c7b
Reviewed-on: https://gerrit.chromium.org/gerrit/36764
Reviewed-by: Vic Yang <victoryang@chromium.org>
Commit-Ready: Tom Wai-Hong Tam <waihong@chromium.org>
Tested-by: Tom Wai-Hong Tam <waihong@chromium.org>
4 files changed