Use the content of the call log to predict the contact info.

This change re-instroduces the cache stored in the call log table for
the contact info associated with a call.

This is the first part of the necessary changes. In this change, I also
use the stored information, I do not update it when the contact is
actually looked up in the call log.

Bug: 5101753
Change-Id: Ib906e9af06410c2cc295192cd4623b011fa0ad09