AudioManager: Use setAvrcpAbsoluteVolume in adjustStreamVolume

Use setAvrcpAbsoluteVolume() instead of adjustAvrcpAbsoluteVolume in
adjust stream volume in order to better sync device volume and remote
Bluetooth device volume. This will allow Bluetooth to avoid calculating
its own volume step size.

Bug: 68812037
Test: Connect to device that supports Absolute Volume and see that
      volume changed occur when changing volume on device.

Change-Id: I26d5812ee1a5953b6527561ce5ad1c5d944c244d