Display network name in status bar

When config_showOperatorNameInStatusBar is true, "Network name" setting
is displayed in Settings app (Settings > Display).
The user can turn on/off the feature to display the network name in the
status bar from Settings app.

Fixes: 67620513
Test: manual - go to Settings > Display and turn on/off Network name.

Change-Id: I43f1d9cbea363527250639ce6146f1c5c6c8a482
diff --git a/res/xml/display_settings.xml b/res/xml/display_settings.xml
index 18bfe57..a6efb5c 100644
--- a/res/xml/display_settings.xml
+++ b/res/xml/display_settings.xml
@@ -84,6 +84,11 @@
         android:fragment="com.android.settings.display.ScreenZoomSettings"
         settings:keywords="@string/screen_zoom_keywords" />
 
+    <SwitchPreference
+        android:key="show_operator_name"
+        android:title="@string/show_operator_name_title"
+        android:summary="@string/show_operator_name_summary" />
+
     <Preference
         android:key="screensaver"
         android:title="@string/screensaver_settings_title"