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.

Bug: 11596853
Change-Id: Iffb7bf369062264dd773338c732bc69318d90b73