PBAP over L2CAP

Update PBAP to be compliant with socket connections over L2CAP in
addition to RFCOMM.  Additionally now requires SDP to complete before
connection.

Bug: 31062208
Change-Id: Idc991d871e9a67c7d6b631cafbfb98ff45d63c38
(cherry picked from commit ea2543a5009459fee3581d2fd8b2271511d31a4c)
7 files changed