net_test_avrcp: fix unit tests

Take into account the change with auto a2dp connection after avrcp only
remote connection.

Bug: 353659040
Flag: com.android.bluetooth.flags.avrcp_connect_a2dp_delayed
Test: atest --host net_test_avrcp
Change-Id: Ic6ce05991aaf1c84588a133b80d806bce334fe7b