HFPClient call disconnect cause

When a phone call goes from Alerting to Terminated make sure that it
goes into the missed call log rather than the incomming call log.

Bug: 64936887
Test: Receive an incomming phonecall terminate it before answering from
any point, ensure that the record shows up in Missed call log.

Change-Id: Ia650da56e6753f72bbd8d2f344efe90104889d48