Fix: policy enforcement for location wifi scanning

Make DISALLOW_CONFIG_LOCATION effectively disallow wifi scanning and
bluetooth scanning settings for location services.

screenshots: http://shortn/_EUOdqrOcnS, http://shortn/_j320QDm1Zo

Bug: 228315522
Bug: 228315529
Test: atest SettingsRoboTests, on device

Change-Id: I78291579a79e915a27ebdd051b3caf3fc04efc41
(cherry picked from commit fcae147f58)

src/com/android/settings/location/LocationServicesWifiScanningPreferenceController.java

@@ -17,9 +17,13 @@ package com.android.settings.location;
 
 import android.content.Context;
 import android.net.wifi.WifiManager;
+import android.os.UserManager;
+
+import androidx.preference.Preference;
 
 import com.android.settings.R;
 import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.RestrictedPreference;
 
 /**
  * Preference controller for Wi-Fi scanning in Location Services.
@@ -33,6 +37,13 @@ public class LocationServicesWifiScanningPreferenceController extends BasePrefer
         mWifiManager = context.getSystemService(WifiManager.class);
     }
 
+    @Override
+    public void updateState(Preference preference) {
+        ((RestrictedPreference) preference).checkRestrictionAndSetDisabled(
+                UserManager.DISALLOW_CONFIG_LOCATION);
+        refreshSummary(preference);
+    }
+
     @Override
     public CharSequence getSummary() {
         final boolean wifiScanOn = mWifiManager.isScanAlwaysAvailable();