Allow setup app to have SAW permission

Why not SYSTEM_APPLICATION_OVERLAY: The setup app shouldn't be able to
show an overlay on top of apps that don't consent to it.

Change-Id: I8a9d6d409ab1082bc36e4ffd220632a501dc2dca
Test: adb shell dumpsys permission | grep -C10 SYSTEM_ALERT_WINDOW
Test: atest CtsPermission2TestCases
Bug: 182471350
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 99ad6d1..9e1295f 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -2775,11 +2775,11 @@
          The app can check whether it has this authorization by calling
          {@link android.provider.Settings#canDrawOverlays
          Settings.canDrawOverlays()}.
-         <p>Protection level: signature|appop|installer|appPredictor|pre23|development -->
+         <p>Protection level: signature|setup|appop|installer|appPredictor|pre23|development -->
     <permission android:name="android.permission.SYSTEM_ALERT_WINDOW"
         android:label="@string/permlab_systemAlertWindow"
         android:description="@string/permdesc_systemAlertWindow"
-        android:protectionLevel="signature|appop|installer|appPredictor|pre23|development" />
+        android:protectionLevel="signature|setup|appop|installer|appPredictor|pre23|development" />
 
     <!-- @SystemApi @hide Allows an application to create windows using the type
          {@link android.view.WindowManager.LayoutParams#TYPE_APPLICATION_OVERLAY},