Merge changes from topic "remove_hard_coded_attributes"

* changes:
  audio: get rid of hardcoded translation stream <--> attributes
  audiopolicy: engine: remove deprecated APIs
  audiopolicy: exclusive Preferred Device
  audiopolicy: apm: switch to new Engine APIs
  audio policy service: Add introspection API to retrieve AudioProductStrategies
  audiopolicy: engineconfigurable: Merge Policy Engine and Wrapper configuration files
  audiopolicy: engineconfigurable: add configuration of ProductStrategies
  audiopolicy: engine: Add ProductStrategy common code