Move OemNetworkPreferences aidl to connectivity

Move the IOnSetOemNetworkPreferenceListener aidl definition to
framework-connectivity.
The interface is an internal implementation detail of
framework-connectivity, so it should be built inside the jar.

Bug: 181512874
Test: m
Change-Id: I898049b50fc620ee629587a9303f058e0a6d0272

framework/src/android/net/IOnSetOemNetworkPreferenceListener.aidl

@@ -0,0 +1,23 @@
+/**
+ *
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net;
+
+/** @hide */
+oneway interface IOnSetOemNetworkPreferenceListener {
+    void onComplete();
+}