Fix call duration for unanswered/missed calls.

Made call times be equivalent to Jellybean/Kitkat.
Missed calls, rejected calls, unanswered outgoing calls all show 0:00.
Missed calls in particular dont show a time at all.

Tested with Conference calls, Active/Hold, Rejected, Missed,
Outgoing->Rejected, Outgoing->End Call.

Bug: 18403859
Change-Id: I60bedc425681808d48d768a435f86f2545916de1