Show toast for invisible systemUI

CarSystemUI is running on u0 and is invisible on display 0, but it
should be able to send out toast.

Bug: 277646621
Test: On car build, enable drive state then click on profile swith panel
Test: atest android.widget.cts.ToastTest
Test: atest 1B151FQGR00060 NotificationManagerServiceTest on bluejay
Change-Id: I29abac50295b6147e8bb3d6a17c4023d7765471e