HFP 1.7 profile update (4/4)

-> Added HF Indicator support.
-> Sent a Broadcast intent upon receiving AT + BIND and
   AT + BIEV Events with the required parameters
-> Support for sending +BIND response on indicator
   status change

Bug: 19983867
Change-Id: I2580fc771080f1bc92fc4ddd5ca7c7cb57773183