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/clk/clk.c b/drivers/clk/clk.c
index 928ad13..eb75132 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -44,8 +44,10 @@
 	}
 
 	clk->enable_count = 0;
+
 	/* Store back pointer to clk from udevice */
-	clk->dev->uclass_priv = clk;
+	/* FIXME: This is not allowed...should be allocated by driver model */
+	dev_set_uclass_priv(clk->dev, clk);
 
 	return 0;
 }