Adding code from CM7 to allow handling of voice mail notifications for Canadian providers

Also expected to fix unknown phone number issues.

Original commit from @Maxxy13: https://bitbucket.org/codefirex/frameworks_opt_telephony/commits/68121f105a73329705f3368c1455f888d3203754

Change-Id: I2b45c8795aaf80732e4d7acc04cb5b78a6447503