CHERRY-PICK: Auto detect ethernet and hide FA utility

BUG=chrome-os-partner:18533
TEST=Manual test run AudioQuality

Change-Id: I92e9ad02b07b1224edf5dd5db806c0933fbd10cf
Original:Change-Id: I51b839e8f617637b9023ac15b790eb0e87e6f823
Original:Reviewed-on: https://gerrit.chromium.org/gerrit/50027
Original:Reviewed-by: Hsinyu Chao <hychao@chromium.org>
Original:Commit-Queue: Heng-ruey Hsu <henryhsu@chromium.org>
Original:Tested-by: Heng-ruey Hsu <henryhsu@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/56770
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
Commit-Queue: Heng-ruey Hsu <henryhsu@chromium.org>
Tested-by: Heng-ruey Hsu <henryhsu@chromium.org>
3 files changed