Add support for Silent Redial and SRVCC

1. Silent Redial uses the same notifications as SRVCC. Add support
to handle the notifications in CDMA mode.
2. Frameworks and UI support for connection handover.

Change-Id: Icc1f9ad50a1dcb53a2af1aae8d296af7101676aa
Conflicts:
src/java/com/android/internal/telephony/Phone.java
src/java/com/android/internal/telephony/cdma/CdmaCallTracker.java