Adjust display name of call log for 4G conference call

The conference call namber contains semicolon, Contact does not
return the proper contact info so that the display name is not
proper. Separately query the contact info to combine the display
name according to the every number.

Change-Id: I0ff2f3b2da2f0a7cfb0052f01c7a5d17054e0775
CRs-Fixed: 1060346