AbsoluteVolume change custom call to official API

BT mainline effort to remove hidden api:
`avrcpSupportsAbsoluteVolume` only inform for a new volume behavior and
AudioManager already provide such method.

Bug: 190422401
Tag: #refactor
Test: Manual: Start bluetooth, play music and change volume from speaker/phone
Change-Id: I45b4480992aba40d4ae8a6f0867a3037fea29d11