[Provider Model] Show carrier network to internet preference

- If the connected network is the merged carrier Wi-Fi, then show
carrier network to internet prefernce.

Bug: 191091045
Test: manual test
atest -c InternetUpdaterTest

Change-Id: Iad3869f086ea0a4d0607691c6709ee12567831c7

tests/unit/src/com/android/settings/network/InternetUpdaterTest.java

@@ -39,6 +39,7 @@ import android.content.Context;
 import android.content.IntentFilter;
 import android.net.ConnectivityManager;
 import android.net.NetworkCapabilities;
+import android.net.wifi.WifiInfo;
 import android.net.wifi.WifiManager;
 
 import androidx.lifecycle.Lifecycle;
@@ -194,4 +195,17 @@ public class InternetUpdaterTest {
 
         assertThat(mInternetUpdater.getInternetType()).isEqualTo(INTERNET_ETHERNET);
     }
+
+    @Test
+    public void updateInternetType_carrierWifiConnected_getInternetCellular() {
+        final WifiInfo wifiInfo = mock(WifiInfo.class);
+        doReturn(wifiInfo).when(mWifiManager).getConnectionInfo();
+        doReturn(true).when(wifiInfo).isCarrierMerged();
+        mInternetUpdater.mInternetAvailable = true;
+        mInternetUpdater.mTransport = TRANSPORT_WIFI;
+
+        mInternetUpdater.updateInternetType();
+
+        assertThat(mInternetUpdater.getInternetType()).isEqualTo(INTERNET_CELLULAR);
+    }
 }