faft: Pressing Power + Esc + F3 directly boots into USB stick

In the design of keyboard controlled recovery, pressing Power + Esc + F3
directly boots into USB stick (if presented) and doesn't require users to
unplug it first.

So change the test logic for it.

BUG=chrome-os-partner:11826
TEST=Run firmware_RecoveryButton on Snow passed.

Change-Id: Id0b67b050844a51e82821da6f281bbe7ab932fa1
Reviewed-on: https://gerrit.chromium.org/gerrit/28930
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>
1 file changed