Add Unknown Call Type to call logs

Some applications that import call logs from xml create records of an unknown call type.

This prevents Phone application / Contacts from exceptioning out due to the thrown exception by returning an "Unknown Call" with a ? icon

Patch-set 2: add missing string
Patch-set 3: type / spacing cleanup

Change-Id: I93120844dc0cabd63cc5f4701a62cf70877f3ba5