DO NOT MERGE Dont restore focus on new HUN window

When a HUN window shows for the first time, Android framework can try to
find a default focus. As such, the FPV may try to focus the topmost HUN
by default, without having nudged to the HUN window.

Bug: 175897692
Test: manual (reboot and trigger HUN via kitchen sink)
Change-Id: Id4008c587aea353dc0c441593fe32e6e9fea5463
diff --git a/packages/CarSystemUI/res/layout/headsup_container_bottom.xml b/packages/CarSystemUI/res/layout/headsup_container_bottom.xml
index f43f02d..c28da39 100644
--- a/packages/CarSystemUI/res/layout/headsup_container_bottom.xml
+++ b/packages/CarSystemUI/res/layout/headsup_container_bottom.xml
@@ -35,7 +35,8 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent"/>
+        app:layout_constraintTop_toTopOf="parent"
+        app:shouldRestoreFocus="false"/>
 
     <View
         android:id="@+id/scrim"