Make BluetoothManagerCallback oneway to prevent waiting on response

Bug: 27384453
Change-Id: I2cd0f1bc03c7a1e887c89faa18d5baa6ca5be24a
diff --git a/core/java/android/bluetooth/IBluetoothManagerCallback.aidl b/core/java/android/bluetooth/IBluetoothManagerCallback.aidl
index 1385daf..8104d21 100644
--- a/core/java/android/bluetooth/IBluetoothManagerCallback.aidl
+++ b/core/java/android/bluetooth/IBluetoothManagerCallback.aidl
@@ -23,7 +23,7 @@
  *
  * {@hide}
  */
-interface IBluetoothManagerCallback {
+oneway interface IBluetoothManagerCallback {
     void onBluetoothServiceUp(in IBluetooth bluetoothService);
     void onBluetoothServiceDown();
     void onBrEdrDown();