Peer support of Absolute Volume to be updated only if device supports A2DP

Peer support of absolute Volume feature should be updated to Audio
frameworks only for device which supports A2DP Sink and AVRCP Absolute
Volume TG roles together.
Audio manager need not be updated for AVRCP only peer devices as
that would cause sudden rise in ongoing stream volume when avrcp only
device connects, if it is set to some lower value with other device
connected for A2DP.

Change-Id: I75509d0b0fd1b06fa08390940a327dd2887d7562