[DU04-2]Appropriate changes to the NetworkPolicyManager API

Divide the NetworkPolicyManager API
notifyStatsProviderWarningOrLimitReached into the following two APIs:
1. notifyStatsProviderWarningReached()
2. notifyStatsProviderLimitReached()

Bug: 216474563
Test: atest NetworkStatsServiceTest NetworkPolicyManagerTest
            NetworkPolicyManagerServiceTest OffloadControllerTest
Change-Id: Ic413eb532b5e24d4a7e2afabdcf643ab6607b1ed

framework-t/src/android/net/netstats/provider/INetworkStatsProviderCallback.aidl

@@ -26,6 +26,7 @@ import android.net.NetworkStats;
 oneway interface INetworkStatsProviderCallback {
     void notifyStatsUpdated(int token, in NetworkStats ifaceStats, in NetworkStats uidStats);
     void notifyAlertReached();
-    void notifyWarningOrLimitReached();
+    void notifyWarningReached();
+    void notifyLimitReached();
     void unregister();
 }

framework-t/src/android/net/netstats/provider/NetworkStatsProvider.java

@@ -152,19 +152,19 @@ public abstract class NetworkStatsProvider {
         try {
             // Reuse the code path to notify warning reached with limit reached
             // since framework handles them in the same way.
-            getProviderCallbackBinderOrThrow().notifyWarningOrLimitReached();
+            getProviderCallbackBinderOrThrow().notifyWarningReached();
         } catch (RemoteException e) {
             e.rethrowAsRuntimeException();
         }
     }
 
     /**
-     * Notify system that the quota set by {@link #onSetLimit} or limit set by
+     * Notify system that the limit set by {@link #onSetLimit} or limit set by
      * {@link #onSetWarningAndLimit} has been reached.
      */
     public void notifyLimitReached() {
         try {
-            getProviderCallbackBinderOrThrow().notifyWarningOrLimitReached();
+            getProviderCallbackBinderOrThrow().notifyLimitReached();
         } catch (RemoteException e) {
             e.rethrowAsRuntimeException();
         }

service-t/src/com/android/server/net/NetworkStatsService.java

@@ -2393,10 +2393,17 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
         }
 
         @Override
-        public void notifyWarningOrLimitReached() {
-            Log.d(TAG, mTag + ": notifyWarningOrLimitReached");
+        public void notifyWarningReached() {
+            Log.d(TAG, mTag + ": notifyWarningReached");
             BinderUtils.withCleanCallingIdentity(() ->
-                    mNetworkPolicyManager.notifyStatsProviderWarningOrLimitReached());
+                    mNetworkPolicyManager.notifyStatsProviderWarningReached());
+        }
+
+        @Override
+        public void notifyLimitReached() {
+            Log.d(TAG, mTag + ": notifyLimitReached");
+            BinderUtils.withCleanCallingIdentity(() ->
+                    mNetworkPolicyManager.notifyStatsProviderLimitReached());
         }
 
         @Override