The sounds are present in the build but are turned off by
default (and there isn't currently a UI to turn them on).
(Mentioned in http://b/2469862)
Change-Id: I9ded1d67cc19204113047aeb8fc8b0123cea1427
Add a new top-level setting for car/desktop dock settings.
Sub menu contains one item - Audio (settings)
Sub text for Audio shows current docked status and launches either the
audio settings or a dialog saying that you're not docked and you need to
buy a new dock from Google (kidding).