Use preference for about phone page instead of injection.

It's faster than tile injection. The fragment comes from Settings
itself, we don't have to use to injection.

Bug: 118168552
Test: robotest
Change-Id: If6a79dd73f8a51dbb21338a40f22dc8b8f8c8cb8

src/com/android/settings/deviceinfo/aboutphone/TopLevelAboutDevicePreferenceController.java

@@ -0,0 +1,39 @@
+/*
+ * 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.deviceinfo.aboutphone;
+
+import android.content.Context;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.deviceinfo.DeviceModelPreferenceController;
+
+public class TopLevelAboutDevicePreferenceController extends BasePreferenceController {
+
+    public TopLevelAboutDevicePreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return DeviceModelPreferenceController.getDeviceModel();
+    }
+}