AVRCP: Ignore addressed player changed to telecom

* During a phone call, com.android.server.telecom is chosen by the media
  framework as the addressed player. It listens to media button presses
  to control various call functions.
* Bluetooth uses Hands Free Profile (HFP) instead of media buttons to
  control phone calls. Therefore, Bluetooth does not need to interact
  with telecom's HeadsetMediaButton during a call.
* Moreover, switching addressed player during SCO codec negotiation
  confuses some car kits, making HFP not functional.
* This CL ignores addressed player change to telecom.

Bug: 64043110
Test: Make a phone call while playing music, AVRCP and HFP regression
Change-Id: If01b84275f8aab23d793e321f71b6b46e8e926aa