Fix for call timer resetting when starting IMS conference call. 3/4

- Pass the connect time of the connection representing the conference
to the conference itself.  This ensures when we notify telecom of the
conference, its connect time will reflect the earliest call.

Bug: 18959443
Change-Id: I96b6ba2e862f45b5ae0d624b483d3278afa67516
1 file changed