mouse: Add method to show/hide the system pointer

Add a new set_ptr_visible() method to the mouse uclass to allow hiding
and showing the system mouse pointer. This is useful with sandbox when
rendering a custom mouse pointer, such as in expo mode.

The method is optional and returns -ENOSYS if not supported by the
driver.

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/input/mouse-uclass.c

@@ -83,6 +83,16 @@ int mouse_get_pos(struct udevice *dev, struct vid_pos *pos)
 	return 0;
 }
 
+int mouse_set_ptr_visible(struct udevice *dev, bool visible)
+{
+	struct mouse_ops *ops = mouse_get_ops(dev);
+
+	if (!ops->set_ptr_visible)
+		return -ENOSYS;
+
+	return ops->set_ptr_visible(dev, visible);
+}
+
 UCLASS_DRIVER(mouse) = {
 	.id		= UCLASS_MOUSE,
 	.name		= "mouse",