Fix drag and drop and resize freeform window broken on secondary display

Set the input surface's parent to the display overlay so it could set
the corresponding layer stack.

Test: enabled simulate display and freeform, move or resize the window,
Test: drag and drop content on second display
Bug: 234405646
Change-Id: I6720a077dededc13d674ba1f80ce9b6b5169f613

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

@@ -165,6 +165,7 @@ class DragState {
                     .setContainerLayer()
                     .setName("Drag and Drop Input Consumer")
                     .setCallsite("DragState.showInputSurface")
+                    .setParent(mDisplayContent.getOverlayLayer())
                     .build();
         }
         final InputWindowHandle h = getInputWindowHandle();

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

@@ -73,6 +73,7 @@ class TaskPositioningController {
                     .setContainerLayer()
                     .setName("Drag and Drop Input Consumer")
                     .setCallsite("TaskPositioningController.showInputSurface")
+                    .setParent(dc.getOverlayLayer())
                     .build();
         }