Add support for SRVCC during a ringing call

When checking for more than one ringing call, if multiple
ringing calls are due to SRVCC, i.e having the same address
then do not disconnect the ringing call on CS.

Change-Id: I60a80286c8c671391044006efb65775b58edce58
CRs-Fixed: 539111

Conflicts:
	src/java/com/android/internal/telephony/CallManager.java