Correct CDMA conference establishment issue.

When making an outgoing call on the device while simultaneously receiving
an incoming call, there is a possibility for one of the calls to be added
to the cdma conference before the call has itself been added to the
ConnectionService as a tracked call.

Test: Manual
Bug: 34033942
Change-Id: I1fffc642ae8bd36cef92bd2d669e675ddb651de4
1 file changed