Update song start time and current Position

Update song start time and current position only when change in
metadata detected or Audio manager updates the time when playstatus
changes or seek is performed on media player.

CRs-Fixed: 674410
Change-Id: Ib0f1f9a551008084584ccfdcdff302c424d6214a
Bluetooth: Move CAF strings

Change-Id: If0166e83efba37441f271bcd2afd303880af4ceb