Add Adaptive brightness as an inline result in Search

Bug: 34740449
Test: make RunSettingsRoboTests
Change-Id: I71acdcc04780a76263171a9d312d88a1eb61624a

src/com/android/settings/DisplaySettings.java

@@ -185,5 +185,12 @@ public class DisplaySettings extends DashboardFragment {
 
                     return result;
                 }
+
+                @Override
+                public List<PreferenceController> getPreferenceControllers(Context context) {
+                    final List<PreferenceController> controllers = new ArrayList<>();
+                    controllers.add(new AutoBrightnessPreferenceController(context));
+                    return controllers;
+                }
             };
 }