Increase from 3sec to 4sec for Check A2dp ready retry.

Some remotes are taking time to send a2dp start when call hangup.
When Call hangup has been done MM-Audio doing audio_check_a2dp_ready()
and we are sending Ack Fail after retry has been done for 3sec,
although remote suspend flag got cleared. After that remote sent start,
but at the same time we send Ack fail to MM due to retry completed for
3sec. So keep retry for Check A2dp ready if it fails till 4 sec.

CRs-Fixed: 2217989
Change-Id: Ie4f50ad206564f4eafe5740ff74d47a9eebd31ac