(factory-980B) factory_Audio: allow initializing volume.

Partners may perfer larger volume when testing audio.

BUG=none, found by partner suggestion
TEST=add audio_init_volume=90 in test_list and finished audio test.

Change-Id: Ic9be7d7d43d15b1da5ba1fa80d0f8d610f207c20
Reviewed-on: http://gerrit.chromium.org/gerrit/10394
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
1 file changed