[DU04-1]Remove NetworkPolicyManagerInternal from NetworkStatsService

Expose system APIs for use by NetworkStatsService.

Bug: 211843446
Test: atest NetworkStatsServiceTest NetworkPolicyManagerTest
            NetworkPolicyManagerServiceTest
Change-Id: I56a066b7f4b4c2c8fefdd185c2e50de63b1e2629
diff --git a/service-t/src/com/android/server/net/NetworkStatsService.java b/service-t/src/com/android/server/net/NetworkStatsService.java
index e15acf3..878056b 100644
--- a/service-t/src/com/android/server/net/NetworkStatsService.java
+++ b/service-t/src/com/android/server/net/NetworkStatsService.java
@@ -156,7 +156,6 @@
 import com.android.net.module.util.CollectionUtils;
 import com.android.net.module.util.NetworkStatsUtils;
 import com.android.net.module.util.PermissionUtils;
-import com.android.server.LocalServices;
 
 import java.io.File;
 import java.io.FileDescriptor;
@@ -2120,7 +2119,7 @@
         public void notifyWarningOrLimitReached() {
             Log.d(TAG, mTag + ": notifyWarningOrLimitReached");
             BinderUtils.withCleanCallingIdentity(() ->
-                    mNetworkPolicyManager.onStatsProviderWarningOrLimitReached());
+                    mNetworkPolicyManager.notifyStatsProviderWarningOrLimitReached());
         }
 
         @Override