Fix issue with deletion of SIM ontacts with "=".

Fix issue for deletion of SIM contacts with "=" in name, as it would
return 3 strings instead of 2 as expected.  Use overloaded split
method to return 2 strings instead to resolve the issue.

CRs-Fixed: 753103
Change-Id: Ia233ed535199c64dc2252aba8470e59aeb5694f7