Remove Cast from Display settings.

Update the display settings xml to remove the wifi-display settings.

Change-Id: I5363e1a9c4e89af8eaa64512a72cf42160b0fee6
Bug: 34975969
Test: Visual
diff --git a/res/xml/ia_display_settings.xml b/res/xml/ia_display_settings.xml
index ed026f1..cb58ef2 100644
--- a/res/xml/ia_display_settings.xml
+++ b/res/xml/ia_display_settings.xml
@@ -110,12 +110,6 @@
                 android:title="@string/device_theme"
                 android:summary="%s" />
 
-        <Preference
-                android:key="wifi_display"
-                android:title="@string/wifi_display_settings_title"
-                settings:keywords="@string/keywords_display_cast_screen"
-                android:fragment="com.android.settings.wfd.WifiDisplaySettings" />
-
         <DropDownPreference
                 android:key="vr_display_pref"
                 android:summary="%s"