Show Hotspot network in Network & internet settings

- Show Hotspot icons

- Show getAlternateSummary instead of original getSummary

Fix: 308187592
Test: unit test
atest -c InternetPreferenceControllerTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a9ea40dc71362b372c5adc89b82dbe2024253688)
Merged-In: I8afe54edebc904c9ec936f5851a33c6c20f13e29
Change-Id: I8afe54edebc904c9ec936f5851a33c6c20f13e29

src/com/android/settings/wifi/WifiSummaryUpdater.java

@@ -36,7 +36,7 @@ import com.android.settingslib.wifi.WifiStatusTracker;
  * Helper class that listeners to wifi callback and notify client when there is update in
  * wifi summary info.
  */
-public final class WifiSummaryUpdater extends SummaryUpdater {
+public class WifiSummaryUpdater extends SummaryUpdater {
 
     private final WifiStatusTracker mWifiTracker;
     private final BroadcastReceiver mReceiver;