Maintain a list of all Bluetooth docks.
Maintain a list of all Bluetooth docks.

With this change, isBluetoothDock API can be used anytime and is not in tied
to dock state. The Dock State is a sticky intent so users
can query for the dock state.

Dr No: Eastham
Bug: 2133530

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base