AbsVol: send per device the abs volume state to APM

Sending the normal computed index to the AudioPolicyManager together
with the devices which are operating in absolute volume mode. The APM is
responsible for avoiding the double attenuation based on this
information.

Flag: com.android.media.audio.abs_volume_index_fix
Test: logs manual - DEBUG_VOL = true
Bug: 340693050
Change-Id: I9435723b0bc100f74553ff87c1407355117194b6