Improve VCARD filter logic and reduce log spam

Remove a stray log message in VCardFilter.applyFilter() function that
leads to high-frequency log spam during phone book synchronization. Also
refactored the logic to avoid multiple loops & loop iterations causing
higher CPU load.

Bug: 18913091
Change-Id: I3c6d3c3373d4a74a930d182ee2641959461b0556