Audio: SetForceUse config check in AudioService

 - Audio is routed to headset when BT is turned off while audio is
   played on speaker
 - Mediarouter does not have setForce device information when app forces
   audio to speaker. So while disconnecting BT, MediaRouter is routing
   audio to headset instead of speaker.
 - Added check for setforce config in AudioService.

 CRs-Fixed: 578316

Change-Id: Ie929f407bfa12eacd29cf36031024a4a6a979b63