Bluetooth: Check A2dp device priority.

For incoming connections stack does not check priority
of device.Add support to check priority of device in stack
for incoming connection.

Change-Id: Icc78d22048800bd448a93f96ab31e2673ce28dca
CRs-Fixed: 510957
Merge "Bluetooth: Check A2dp device priority."
hardware: Add an ifdef to disable id match check

When wrapping HAL modules (for example camera wrapping vendor-camera), this
match check prevents vendor-camera to be loaded because its original name
is camera and not vendor-camera.

Change-Id: If79a941b54d83610638041440db907ae593b2e91