Disable system alert window permissions on low ram devices

Bug: 63697002
Bug: 117832554
Test: adb am start-activity -a
android.settings.action.MANAGE_OVERLAY_PERMISSION
Change-Id: I44c64001cd07fd4934cdc55f455384cebd5c9cfb
diff --git a/res/xml/special_access.xml b/res/xml/special_access.xml
index 4417d0f..05f4a81 100644
--- a/res/xml/special_access.xml
+++ b/res/xml/special_access.xml
@@ -42,7 +42,8 @@
         android:key="system_alert_window"
         android:title="@string/system_alert_window_settings"
         android:fragment="com.android.settings.applications.manageapplications.ManageApplications"
-        settings:keywords="@string/keywords_system_alert_window">
+        settings:keywords="@string/keywords_system_alert_window"
+        settings:controller="com.android.settings.applications.specialaccess.SystemAlertWindowPreferenceController">
         <extra
             android:name="classname"
             android:value="com.android.settings.Settings$OverlaySettingsActivity" />