IMS: CallForward Timer unconditional

1) Filling response data in CallForwardInfo
   structure
2) These changes are required for new api
   in ImsPhone.These are required to support
   UI flow.
3) Added MMI functionality.
4) Introduced new API, which can be called
   from UI to set and query CallForward
   Timer.

Conflicts:
        src/java/com/android/internal/telephony/PhoneBase.java
        src/java/com/android/internal/telephony/imsphone/ImsPhone.java

Change-Id: I4cc6f84c3f7edda46a55dabf91141e8837383192
CRs-Fixed: 689110