Bluetooth: Update remote dropped call state.

In three way call, if one of the remote drops the
active call, DUT should update the call state
change properly.

CRs-Fixed: 506815
Change-Id: I85c31d5889f2dcab43a5b5f8c9174f4cab335925
Merge "Bluetooth: Update remote dropped call state."
Merge remote-tracking branch 'caf/jb_2.5' into cm-10.1