Move ConnectTimeReal to base class Connection.java

Move ConnectTime Real from derived classes GsmConnection
and CdmaConnection to Connection base class.
This gives the flexibility
to access ConnectTimeReal from different derived classes
using base class object.
This is needed to transfer time from ImsConnection
to CS connection for SRVCC.

Change-Id: I4f2a834f9df27514373de22a1c71d3923b66dc14
CRs-Fixed: 412754
(cherry picked from commit a8a1eb130bd51bcedad53f77fc31174f4b2cd3eb)
(cherry picked from commit a568c5244e70dd5f06bd073f48fe881f4c217edc)
(cherry picked from commit 737dda096eeee1fa5bbd30c9e324d1f73fdc68bf)