Remove call to setLayerStack for BlackFrame Surface

There's no need for the black frame to call setLayerStack since it's a
child of the overlay layer. Calling setLayerStack does nothing, but it
will produce an error message in SurfaceFlinger since the caller is
trying to set a specified layerStack on a layer that's not the root.
Deleting thihs code to remove the error spam in logcat.

Also removed it from the Watermark code since it's also a child of the
overlay layer.

Bug: 144824244
Test: No more error log about invalid layerStack in SF
Change-Id: I2f64d50d81af9caf8debe289c4a8eda7c2a61031

services/core/java/com/android/server/wm/BlackFrame.java

@@ -52,7 +52,6 @@ public class BlackFrame {
                     .setParent(surfaceControl)
                     .build();
             transaction.setWindowCrop(surface, w, h);
-            transaction.setLayerStack(surface, dc.getDisplayId());
             transaction.setAlpha(surface, 1);
             transaction.setLayer(surface, layer);
             transaction.setPosition(surface, left, top);

services/core/java/com/android/server/wm/Watermark.java

@@ -121,8 +121,7 @@ class Watermark {
                     .setBufferSize(1, 1)
                     .setFormat(PixelFormat.TRANSLUCENT)
                     .build();
-            t.setLayerStack(ctrl, mDisplay.getLayerStack())
-                    .setLayer(ctrl, WindowManagerService.TYPE_LAYER_MULTIPLIER * 100)
+            t.setLayer(ctrl, WindowManagerService.TYPE_LAYER_MULTIPLIER * 100)
                     .setPosition(ctrl, 0, 0)
                     .show(ctrl);
             mSurface.copyFrom(ctrl);