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_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c
index 68d5dbb..55ebac7 100644
--- a/drivers/clk/rockchip/clk_rk3399.c
+++ b/drivers/clk/rockchip/clk_rk3399.c
@@ -18,6 +18,7 @@
 #include <asm/arch-rockchip/clock.h>
 #include <asm/arch-rockchip/cru.h>
 #include <asm/arch-rockchip/hardware.h>
+#include <dm/device-internal.h>
 #include <dm/lists.h>
 #include <dt-bindings/clock/rk3399-cru.h>
 #include <linux/bitops.h>
@@ -1425,7 +1426,7 @@
 						    glb_srst_fst_value);
 		priv->glb_srst_snd_value = offsetof(struct rockchip_cru,
 						    glb_srst_snd_value);
-		sys_child->priv = priv;
+		dev_set_priv(sys_child, priv);
 	}
 
 #if CONFIG_IS_ENABLED(RESET_ROCKCHIP)