BLE-MIDI: change binding for BluetoothMidiService

Add a remote call addBluetoothDevice() using AIDL.
This was needed because onBind() is only called once.

Bug: 23219556
Bug: 23760886
Change-Id: Id7554ca55d596352d11dbd6ae3e403138a29c864
Signed-off-by: Phil Burk <philburk@google.com>
(cherry picked from commit 7cd06c0b9e087a555d2c5dd4cab5b7eac8497526)
6 files changed