audiopolicy: Fix for device selection during concurrent audio playback

On a device selection for an output having strategy SONIFICATION_RESPECTFUL,
the primary output descriptor is checked to make sure SONIFICATION_RESPECTFUL
strategy is present and MEDIA strategy is absent.
This causes unnecessary device routing during a touch tone playback while
the primary output has both SONIFICATION_RESPECTFUL and MEDIA strategies enabled.

Change-Id: Ibf3c1bfd05b68d70c6cb9e8b9b95e989f27c2e75
CRs-Fixed: 773885