[IT06]Move INetworkActivityListener into connectivity module

INetworkActivityListener is hidden and the only usage is inside
the connectivity module. Thus, move this into module scope.

Bug: 170598012
Test: atest FrameworksNetTests
Change-Id: I0a75c440c1daa773217bbd362b212fda4d07ec64

core/java/android/os/INetworkActivityListener.aidl

@@ -1,24 +0,0 @@
-/* Copyright 2013, 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.os;
-
-/**
- * @hide
- */
-oneway interface INetworkActivityListener
-{
-    void onNetworkActive();
-}