[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
diff --git a/framework/src/android/net/IConnectivityManager.aidl b/framework/src/android/net/IConnectivityManager.aidl
index 6391802..160338d 100644
--- a/framework/src/android/net/IConnectivityManager.aidl
+++ b/framework/src/android/net/IConnectivityManager.aidl
@@ -21,6 +21,7 @@
 import android.net.ConnectivityDiagnosticsManager;
 import android.net.IConnectivityDiagnosticsCallback;
 import android.net.IOnSetOemNetworkPreferenceListener;
+import android.net.INetworkActivityListener;
 import android.net.IQosCallback;
 import android.net.ISocketKeepaliveCallback;
 import android.net.LinkProperties;
@@ -36,7 +37,6 @@
 import android.net.QosSocketInfo;
 import android.os.Bundle;
 import android.os.IBinder;
-import android.os.INetworkActivityListener;
 import android.os.Messenger;
 import android.os.ParcelFileDescriptor;
 import android.os.PersistableBundle;