dm: Use access methods for dev/uclass private data

Most drivers use these access methods but a few do not. Update them.

In some cases the access is not permitted, so mark those with a FIXME tag
for the maintainer to check.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Pratyush Yadav <p.yadav@ti.com>
diff --git a/drivers/video/video-uclass.c b/drivers/video/video-uclass.c
index 20f6973..8883e29 100644
--- a/drivers/video/video-uclass.c
+++ b/drivers/video/video-uclass.c
@@ -378,7 +378,7 @@
 		return 0;
 
 	/* Set up the video pointer, if this is the first device */
-	uc_priv = dev->uclass->priv;
+	uc_priv = uclass_get_priv(dev->uclass);
 	if (!uc_priv->video_ptr)
 		uc_priv->video_ptr = gd->video_top;