Allow extended apps to change package name

For the added flexibility of allowing apps that extend from settings to
have a different package name, these instances of com.android.settings
as a xmlns need to be replaced with res-auto (which subsitutes the
package name at build time).

Bug: 174264676
Test: manual (sdk_gphone), make -j20 SettingsRoboTests
Change-Id: I03acda25dbf4d028cc73b77f41ad5dedca110ecb

res/layout/face_enroll_introduction.xml

@@ -18,7 +18,6 @@
 <com.google.android.setupdesign.GlifLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:FaceEnrollAccessibilitySwitch="http://schemas.android.com/apk/res/com.android.settings"
     style="?attr/face_layout_theme"
     android:id="@+id/setup_wizard_layout"
     android:layout_width="match_parent"