Setting to change sysui theme

Users now can manually pick if they want light or dark QS
and launcher

Change-Id: Ic0a43bc5e8777c39bfe5c0bbc606bf6be20f7168
Fixes: 63903361
Test: make RunSettingsRoboTests ROBOTEST_FILTER=SystemUiThemePreferenceControllerTest
Test: manual
diff --git a/res/xml/display_settings.xml b/res/xml/display_settings.xml
index b34fec0..ec8a197 100644
--- a/res/xml/display_settings.xml
+++ b/res/xml/display_settings.xml
@@ -132,9 +132,16 @@
 
     <ListPreference
         android:key="theme"
-        android:title="@string/device_theme"
+        android:title="@string/color_theme"
         android:summary="@string/summary_placeholder" />
 
+    <ListPreference
+        android:key="systemui_theme"
+        android:title="@string/device_theme"
+        android:entries="@array/systemui_theme_entries"
+        android:entryValues="@array/systemui_theme_values"
+        settings:controller="com.android.settings.display.SystemUiThemePreferenceController" />
+
     <Preference
         android:key="vr_display_pref"
         android:title="@string/display_vr_pref_title"