brillo: Move Brillo specific audio utils to audio_utils.py.

Move the Brillo specific audio util functions to
server/brillo/audio_utils.py.

BUG:b/27166458
TEST=test_droid.py suite:brillo-audio + unittests pass

Change-Id: I95cf604283524b7fd94948be1c3352c6ac8e3a7f
Reviewed-on: https://chromium-review.googlesource.com/327684
Commit-Ready: Ralph Nathan <ralphnathan@chromium.org>
Tested-by: Ralph Nathan <ralphnathan@chromium.org>
Reviewed-by: Christopher Wiley <wiley@chromium.org>
5 files changed