Modify audio quality test.

For speaker test, change to use wav file instead of looping.
Use the xtalk stage for THDN test.

BUG=None
TEST=None

Change-Id: I19ccdf62f188c9f2d49d102c2110e2a80449f949
Reviewed-on: https://gerrit.chromium.org/gerrit/30689
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
Tested-by: Hsinyu Chao <hychao@chromium.org>
1 file changed