Add top level privacy hub preference

Bug: 176902658

Test: Manually tested on Sargo DVT
Change-Id: I15d09f0288acadd7599dbe7a2a01223949b40e8f

src/com/android/settings/privacy/PrivacyHubPreferenceController.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.privacy;
+
+import android.annotation.NonNull;
+import android.content.Context;
+import android.provider.DeviceConfig;
+
+import com.android.settings.core.BasePreferenceController;
+
+/**
+ * The preference controller for privacy hub top level preference.
+ */
+public final class PrivacyHubPreferenceController extends BasePreferenceController {
+    public static final String PROPERTY_PRIVACY_HUB_ENABLED = "privacy_hub_enabled";
+
+    public PrivacyHubPreferenceController(@NonNull Context context, @NonNull String key) {
+        super(context, key);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return DeviceConfig.getBoolean(DeviceConfig.NAMESPACE_PRIVACY,
+                PROPERTY_PRIVACY_HUB_ENABLED, false) ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
+    }
+}