PBAP: Fix Functionality failure for PBAP

Usecase:
Connect to DUT from PBAP Client (Carkit)

Expectation:
Carkit is able to browse PBAP SDP and connect to PBAP Profile
with DUT

Observation:
PBAP Connection is successful

Root Cause:
Socket listener not started for PBAP

Fix:
Add changes to properly start listeners for PBAP

Test:
1) Verified that SDP records for PBAP are exposed and can be browsed
  by remote PBAP Client.
2) Connection happens fine and phonebook can eb downloaded properly.

Bug: 35416619
Change-Id: I52acb1c10b91dd5ffecc44badcfd60f0e27b0a55