system_api: adding constants for FTEnabled support

Adding FTEnabled constant.

BUG=chromium:791202
TEST=Unit tests

Change-Id: I5b8c0050bd5da3020877e5c537b63e381b077528
Reviewed-on: https://chromium-review.googlesource.com/985240
Commit-Ready: Matthew Wang <matthewmwang@chromium.org>
Tested-by: Matthew Wang <matthewmwang@chromium.org>
Reviewed-by: Kirtika Ruchandani <kirtika@chromium.org>
Reviewed-by: Kevin Cernekee <cernekee@chromium.org>
1 file changed