Make removeBond() call async.
Make removeBond() call async.

This call has been synchronus since Bluez3.36.
However, since the semantics for all Bluetooth API calls are
asynchronous make this so too. It does fix an occasional ANR
seen while unpairing.

Change-Id: If81f8ec262ea1f6f62775282ab33855a8669c41a

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