Use new CarAudioManager.registerCarVolumeCallback API

Per API review, we deprecated the following APIs
- registerVolumeCallback(IBinder)
- unregisterVolumeCallback(IBinder)

Bug: 120629164
Test: Volume bar shows when changing volume on emulator
Change-Id: I119ac96033cdf8dc1b0cf66ef2440b4e9572157f
1 file changed