Active device manager: Integrate Hearing Aid

* When A2DP/HFP is set to be active, Hearing Aid will be inactive
* When Hearing Aid is set to be active, HFP/A2DP will be inactive
* When Hearing Aid is active, incoming A2DP/HFP connected device
  will not be active
* Change the HearingAidService.setActiveDevice() to return boolean

Test: manual
Bug: 69623109
Change-Id: I8d29078aa4ff2b770cb032aa9b1584520a527067