OBEX: Implementation of MAP and PBAP client role on Bluedroid

Implementation changes to support MAP client and PBAP client
role on Bluedroid stack.

Change-Id: Ic75e0bea10b8420aef928d868cc25acd769d5620
CRs-fixed: 530274
Merge pull request #16 from jsnweitzel/jb3-test

OBEX: Implementation of MAP and PBAP client role on Bluedroid