IMS: Deflect call feature

Code changes to support IMS Deflect call feature.

CRs-Fixed: 713856

Conflicts:
telecomm/java/android/telecomm/ConnectionService.java
telecomm/java/android/telecom/InCallAdapter.java
Change-Id: I74b7fd34cad8d49f660fb05bd33becf6ae1de5d2