HFP 1.7 profile update (3/4)

-> Android Framework changes to add support for
   an API to send indicator change in AG.
-> Added a system intent for broadcasting assigned number(ID)
   of the supported HF indicators and their values (if received)

Bug: 19983867
Change-Id: If26a7ae5da5686da72ebca9ec3decfe086e2ffb6