If the Dock settings is launched after reboot but before it is docked,
the settings screen crashes because the dock status is not available.
This fixes the case where there was never a pending intent for dock status.
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).