PBAP: Check for spurious entries of searched contacts

This patch adds the check to limit the search if we already
have got the contact name by number so that same contact
will not be getting searched more than one number of time.

Change-Id: If4a26433e28cad90394833b51cc3ff0d0bcf7e36
CRs-fixed: 501575
(cherry picked from commit 22565ed325bd96f170897702dc3e0d89850f188e)
(cherry picked from commit ac9a9cd175a9c1f4c3470d0f1f370b8f234a6c52)
(cherry picked from commit c6614f14eca21cbfee44444735d8759bbeea5285)