Add lookup in Call logs to lookupNumber

http://review.cyanogenmod.com/#/c/11168/ added caller name display
to GSM phones. But whenever Call log is opened the information was
overwritten, if no contact is present with that phoen number.
This patch add a lookup function that tries to find a match
in the Call log (after oll ther posibilities are exhausted)
and returns that information to be put in cache.

Change-Id: I7b176da60792191c3eb0490afc703efbace62552