Add a few columns for caching to the call log.

These columns store additional information about the contact associated
with a call log entry and are needed by the new functionality present in
the call log.

The information is used only internally by the call log, so these column
do not need to be part of the public API.

Bug: 5101753
Change-Id: Ie2160a157497f10ba5fc95c5fcf3b4095a99753a