Stop exposing generated AIDL from Tethering

We don't want new modules exposing stable aidl directly. APIs should
be defined as java @SystemApi. It also seems like nothing actually
depend on these interfaces, except one simple exception.

Bug: 147200698
Test: m
Change-Id: Ia4222fa35a9a2f3c75cebb12f75c536f27e2fe16

packages/Tethering/common/TetheringLib/Android.bp

@@ -83,7 +83,6 @@ java_library {
     name: "framework-tethering-stubs",
     srcs: [":framework-tethering-stubs-sources"],
     libs: ["framework-all"],
-    static_libs: ["tethering-aidl-interfaces-java"],
     sdk_version: "core_platform",
 }
 

services/java/com/android/server/SystemServer.java

@@ -44,7 +44,6 @@ import android.database.sqlite.SQLiteGlobal;
 import android.graphics.GraphicsStatsService;
 import android.hardware.display.DisplayManagerInternal;
 import android.net.ConnectivityModuleConnector;
-import android.net.ITetheringConnector;
 import android.net.NetworkStackClient;
 import android.os.BaseBundle;
 import android.os.Binder;
@@ -298,6 +297,9 @@ public final class SystemServer {
             "com.android.server.blob.BlobStoreManagerService";
     private static final String APP_SEARCH_MANAGER_SERVICE_CLASS =
             "com.android.server.appsearch.AppSearchManagerService";
+
+    private static final String TETHERING_CONNECTOR_CLASS = "android.net.ITetheringConnector";
+
     private static final String PERSISTENT_DATA_BLOCK_PROP = "ro.frp.pst";
 
     private static final String UNCRYPT_PACKAGE_FILE = "/cache/recovery/uncrypt_file";
@@ -2331,7 +2333,7 @@ public final class SystemServer {
             try {
                 // TODO: hide implementation details, b/146312721.
                 ConnectivityModuleConnector.getInstance().startModuleService(
-                        ITetheringConnector.class.getName(),
+                        TETHERING_CONNECTOR_CLASS,
                         PERMISSION_MAINLINE_NETWORK_STACK, service -> {
                             ServiceManager.addService(Context.TETHERING_SERVICE, service,
                                     false /* allowIsolated */,