Bug 1061489: Move Bluedroid code out of BluetoothInterface.{cpp,h}, r=shuang

This patch moves BluetoothInterface.{cpp,h} to the generic section
of Gecko's Bluetooth code, and the Bluedroid implementation into
the new files BluetoothHalImplementation.{cpp,h}.

BluetoothHalImplementation.{cpp,h} contains all Bluedroid-specific
code. The classes in BluetoothInterface.{cpp,h} are now interfaces
for Gecko.

--HG--
rename : dom/bluetooth/bluedroid/BluetoothInterface.cpp => dom/bluetooth/bluedroid/BluetoothHALInterface.cpp
Bug 1061489: Distribute Bluetooth HAL implementation among multiple files, r=shuang

The files BluetoothHALInterface.{cpp,h} are getting too large. This patch
moves helper functions and profile implementations into separate files.