Add Connection#EXTRA_ORIGINAL_CONNECTION_ID extra in the

ConnectionRequest when creating an conference.

This is to make sure CTS tests works well since we can only access
created Conference object by overriding
ConnectionService#onCreateIncomingConference and
ConnectionService#onCreateOutgoingConference. Extra added after these
methods cannot properly changed the MockConference instances in CTS
tests.

Bug: 159944852
Test: atest CtsTelecomTestCases:RemoteConferenceTest
Change-Id: I69bf51feec4b3506b728077aa5bf2039ce633a9b