audio-utils: add TODO Reminder to fix this when enabling USB audio. BUG=none TEST=none Change-Id: I1fd7f6afad1c06d7f8ceecf1ff2d0d3e536f0fc4 Signed-off-by: Dylan Reid <[email protected]> Reviewed-on: https://gerrit.chromium.org/gerrit/22670 Reviewed-by: Todd Broch <[email protected]>