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/rockchip/clk_rk3288.c b/drivers/clk/rockchip/clk_rk3288.c
index e87fdfc..6226d55 100644
--- a/drivers/clk/rockchip/clk_rk3288.c
+++ b/drivers/clk/rockchip/clk_rk3288.c
@@ -1018,7 +1018,7 @@
 						    cru_glb_srst_fst_value);
 		priv->glb_srst_snd_value = offsetof(struct rockchip_cru,
 						    cru_glb_srst_snd_value);
-		sys_child->priv = priv;
+		dev_set_priv(sys_child, priv);
 	}
 
 #if CONFIG_IS_ENABLED(RESET_ROCKCHIP)