Revert "Attribute data usage to 5G for 5G non-standalone mode"

This reverts commit 7e5b9894a41436953ef9f06c144414f5db3522cb.

Reason for revert: Revert and wait for the design is settled down.

Change-Id: I10fdfc37d6456678de1886698cd6ad08bf8aa810
diff --git a/services/core/java/com/android/server/net/NetworkStatsSubscriptionsMonitor.java b/services/core/java/com/android/server/net/NetworkStatsSubscriptionsMonitor.java
index dc64393..7711c6a 100644
--- a/services/core/java/com/android/server/net/NetworkStatsSubscriptionsMonitor.java
+++ b/services/core/java/com/android/server/net/NetworkStatsSubscriptionsMonitor.java
@@ -22,7 +22,6 @@
 import android.content.Context;
 import android.os.Looper;
 import android.telephony.Annotation;
-import android.telephony.NetworkRegistrationInfo;
 import android.telephony.PhoneStateListener;
 import android.telephony.ServiceState;
 import android.telephony.SubscriptionManager;
@@ -197,19 +196,7 @@
 
         @Override
         public void onServiceStateChanged(@NonNull ServiceState ss) {
-            // In 5G SA (Stand Alone) mode, the primary cell itself will be 5G hence telephony
-            // would report RAT = 5G_NR.
-            // However, in 5G NSA (Non Stand Alone) mode, the primary cell is still LTE and
-            // network allocates a secondary 5G cell so telephony reports RAT = LTE along with
-            // NR state as connected. In such case, attributes the data usage to NR.
-            // See b/160727498.
-            final boolean is5GNsa = (ss.getDataNetworkType() == TelephonyManager.NETWORK_TYPE_LTE
-                    || ss.getDataNetworkType() == TelephonyManager.NETWORK_TYPE_LTE_CA)
-                    && ss.getNrState() == NetworkRegistrationInfo.NR_STATE_CONNECTED;
-
-            final int networkType =
-                    (is5GNsa ? TelephonyManager.NETWORK_TYPE_NR : ss.getDataNetworkType());
-
+            final int networkType = ss.getDataNetworkType();
             final int collapsedRatType = getCollapsedRatType(networkType);
             if (collapsedRatType == mLastCollapsedRatType) return;