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>
diff --git a/media/packages/BluetoothMidiService/Android.mk b/media/packages/BluetoothMidiService/Android.mk
index 2c9c3c5..0565925 100644
--- a/media/packages/BluetoothMidiService/Android.mk
+++ b/media/packages/BluetoothMidiService/Android.mk
@@ -3,7 +3,8 @@
 
 LOCAL_MODULE_TAGS := optional
 
-LOCAL_SRC_FILES := $(call all-subdir-java-files)
+LOCAL_SRC_FILES += \
+      $(call all-java-files-under,src)
 
 LOCAL_PACKAGE_NAME := BluetoothMidiService
 LOCAL_CERTIFICATE := platform