Added onActiveDeviceChanged() stub implementation

This method has been added to BluetoothCallback to support
Multi-A2DP/Multi-HFP in the Phone's Settings.

Test: Code compilation
Bug: 64767509
Change-Id: If29ca6b898c1b3fff7fa1e1adc5d4cc118deafb3
2 files changed
tree: d83e593819174d27be943e22659dd5fcbf111102
  1. res/
  2. src/
  3. tests/
  4. Android.mk
  5. AndroidManifest.xml