DO NOT MERGE ANYWHERE Set audio route to 0 when none are supported.

CallAudioManager does not need to default to EARPIECE nor SPEAKER if no
audio routes are supported, e.g the device does not have audio output
features. This CL prevents the CallAudioManager from trying to turn some
audio routes on since the route and supportedRoutes are set to 0.

BUG: 28129653
Change-Id: I8c4b41ce8dd64abe9d0e94124ee178a9f2e438ae