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/gpio/s5p_gpio.c b/drivers/gpio/s5p_gpio.c
index 9de9541..796fe3e 100644
--- a/drivers/gpio/s5p_gpio.c
+++ b/drivers/gpio/s5p_gpio.c
@@ -286,8 +286,8 @@
 static int gpio_exynos_probe(struct udevice *dev)
 {
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
-	struct exynos_bank_info *priv = dev->priv;
-	struct exynos_gpio_plat *plat = dev->plat;
+	struct exynos_bank_info *priv = dev_get_priv(dev);
+	struct exynos_gpio_plat *plat = dev_get_plat(dev);
 
 	/* Only child devices have ports */
 	if (!plat)
@@ -307,7 +307,7 @@
  */
 static int gpio_exynos_bind(struct udevice *parent)
 {
-	struct exynos_gpio_plat *plat = parent->plat;
+	struct exynos_gpio_plat *plat = dev_get_plat(parent);
 	struct s5p_gpio_bank *bank, *base;
 	const void *blob = gd->fdt_blob;
 	int node;