Add config for Wi-Fi Hotspot Settings hidden

- Add config_show_wifi_hotspot_settings for Settings customization

- Hide Wi-Fi Hotspot preference in Hotspot & tethering Settings

- Don't launch Wi-Fi Hotspot Settings (e.g long press on Hotspot in QS-tile)

Bug: 213426762
Test: manual test
atest -c com.android.settings.wifi.WifiUtilsTest
make RunSettingsRoboTests ROBOTEST_FILTER=WifiTetherPreferenceControllerTest
make RunSettingsRoboTests ROBOTEST_FILTER=WifiTetherSettingsTest

Change-Id: I11f88d0d15d6d5c2766b64b5847ac31ed0f34c25

src/com/android/settings/wifi/tether/WifiTetherPreferenceController.java

@@ -16,9 +16,10 @@
 
 package com.android.settings.wifi.tether;
 
+import static com.android.settings.wifi.WifiUtils.canShowWifiHotspot;
+
 import android.annotation.NonNull;
 import android.content.Context;
-import android.net.TetheringManager;
 import android.net.wifi.SoftApConfiguration;
 import android.net.wifi.WifiClient;
 import android.net.wifi.WifiManager;
@@ -46,7 +47,6 @@ public class WifiTetherPreferenceController extends AbstractPreferenceController
 
     private static final String WIFI_TETHER_SETTINGS = "wifi_tether";
 
-    private boolean mIsWifiTetherable;
     private WifiManager mWifiManager;
     private boolean mIsWifiTetheringAllow;
     private int mSoftApState;
@@ -59,7 +59,6 @@ public class WifiTetherPreferenceController extends AbstractPreferenceController
         // TODO(b/246537032):Use fragment context to WifiManager service will caused memory leak
         this(context, lifecycle,
                 context.getApplicationContext().getSystemService(WifiManager.class),
-                context.getSystemService(TetheringManager.class),
                 true /* initSoftApManager */,
                 WifiEnterpriseRestrictionUtils.isWifiTetheringAllowed(context));
     }
@@ -69,15 +68,9 @@ public class WifiTetherPreferenceController extends AbstractPreferenceController
             Context context,
             Lifecycle lifecycle,
             WifiManager wifiManager,
-            TetheringManager tetheringManager,
             boolean initSoftApManager,
             boolean isWifiTetheringAllow) {
         super(context);
-        final String[] wifiRegexs = tetheringManager.getTetherableWifiRegexs();
-        if (wifiRegexs != null && wifiRegexs.length != 0) {
-            mIsWifiTetherable = true;
-        }
-
         mIsWifiTetheringAllow = isWifiTetheringAllow;
         if (!isWifiTetheringAllow) return;
 
@@ -93,7 +86,7 @@ public class WifiTetherPreferenceController extends AbstractPreferenceController
 
     @Override
     public boolean isAvailable() {
-        return mIsWifiTetherable && !Utils.isMonkeyRunning();
+        return canShowWifiHotspot(mContext) && !Utils.isMonkeyRunning();
     }
 
     @Override