Add a mechanism for handling audio device configuration change

* Added new call handleDeviceConfigChange() to the Media Framework.
  That call can be used when there are device configuration changes
  (e.g., Bluetooth A2DP codec configuration has changed).
* Added new method AudioPolicyManager::handleDeviceConfigChange().
  That method toggles the UNAVAILABLE/AVAILABLE connection state of the
  device, so it can be reconfigured as appropriate - e.g., the audio
  feeding parameters can be updated.
* Fix ALOGVV compilation errors when extra logging is enabled.

Test: A2DP streaming to headsets
Bug: 30958229
Change-Id: I388abbbb3ec4d1a003b441cb0c77e00d80cad668