Telephony API extension v2

Added the following notifications:

public void notifyPreciseCallState(Phone sender);
public void notifyDisconnectCause(Connection.DisconnectCause cause, int preciseCause);
public void notifyPreciseDataConnectionFailed(Phone sender, String reason, String apnType, String apn, String failCause);

Change-Id: If3b88c679507c529b746046c4a17cf6d9974bd09
Handle DATA_CALL_LIST in DCC and update dataActivity properly

Update mActivity in DCC before notifyDataActivity. Without this change,
the notifyDataActivity was notifying incorrect data activity status
due to race condition between DCT when mActivity was updated and
DCC thread where notifyDataActivity was called.
Merge pull request #1 from deVorteX/omni-4.4

Improvements for data handoff from AOSP