avatar: Connect AV when peer connected only AVRCP test

A2DP test to check a2dp auto connects if supported and only avrcp is connected by remote device.

Bug: 296962438
Flag: com.android.bluetooth.flags.avrcp_connect_a2dp_delayed
Test: atest avatar:A2dpTest#test_ad2p_autoconnect_when_only_avrcp_connected

Change-Id: I7336f1c6d75d98aa6ac2684e23e8b55765ffbf7e