[autotest] audio_AudioAfterReboot: disconnect audio bus at boot

For some Cros device, we need to disconnect audio bus so Cros device can
correctly detect audio jack. Reconnects audio bus when it is needed.

BUG=chromium:533125
TEST=run audio_AudioAfterReboot test on peppy.

Change-Id: Iae095c2f06f43cdd1baf1a9f13d4a4e5015d2169
Reviewed-on: https://chromium-review.googlesource.com/300635
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>
1 file changed