QS Header: post some updates to the header

These sometimes trigger binder calls, that can cause jank on the
first frame of expanding the panel.

Bug: 30442298
Change-Id: Id60fd5ee9732515cd6f9645c7ab307c949dfc506

packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickStatusBarHeader.java

@@ -256,8 +256,10 @@ public class QuickStatusBarHeader extends BaseStatusBarHeader implements
 
     @Override
     public void updateEverything() {
-        updateVisibilities();
-        setClickable(false);
+        post(() -> {
+            updateVisibilities();
+            setClickable(false);
+        });
     }
 
     protected void updateVisibilities() {