MidiBluetoothService: add new device to HashMap

The HashMap is being used but devices never added to the map.

Bug: 23429459
Change-Id: I1da5305a56f5bd48e1c5d9345e721ea8dd2eed4e
Signed-off-by: Phil Burk <philburk@google.com>
(cherry picked from commit e5f722e55c5708c2b48b8c9688c135e451225032)
1 file changed