Introduce boolean flag to show/hide Reset Options.

This adds one new flag:
config_show_reset_dashboard

Which when set to false, will hide Reset Options from System settings.

Bug: 74127210
Test: Updated robotests
Change-Id: I42b14a0abde575f5c4e51985125e8543716d206a

src/com/android/settings/system/ResetPreferenceController.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2018 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.system;
+
+import android.content.Context;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+public class ResetPreferenceController extends BasePreferenceController {
+
+    public ResetPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mContext.getResources().getBoolean(R.bool.config_show_reset_dashboard)
+                ? AVAILABLE
+                : DISABLED_UNSUPPORTED;
+    }
+}