Bluetooth: Header file changes to add new APIs for Test APK

New APIs added to send to test commands and recevie events
from bluedroid stack.

Change-Id: I5981cbbf5d86d3e664c20ccc031ce63ca18b7718
CRs-Fixed: 598650
BT: Added new file bt_multi_hf.h

The new file contents are copied from initial
Bluetooth open source release of file "bt_hf.h"
revision 05f49546. This file will be used for
code modifications for Multi HF implementation.

Change-Id: I6da6d805bdfe3d44b6ec37302a7318cd10f3420c
BT: Multi HF support in libhardware.

This patch adds multi hf support in libhardware.
Adds bd_addr parameter for callbacks from stack.

Conflicts:

	include/hardware/bt_multi_hf.h

Change-Id: I872ba67422ae4310818d7b58ca051085f9146886
Bluetooth: Wipower HAL changes

Include HAL changes for Wipower and Bluetooth LE peripheral features

CRs-fixed: 587811

Change-Id: Idcfb35e548f1411ef34773c64847854ca810a5bb
Bluetooth: Add Wipower power apply events to HAL

Add callbacks and related data structure to introduce
Wipower power apply related events

CRs-fixed: 612628

Change-Id: I294cc3b15f3fae49bcc406279080163895921162