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/lpc32xx_gpio.c b/drivers/gpio/lpc32xx_gpio.c
index ffaec32..de66c76 100644
--- a/drivers/gpio/lpc32xx_gpio.c
+++ b/drivers/gpio/lpc32xx_gpio.c
@@ -295,7 +295,7 @@
 static int lpc32xx_gpio_probe(struct udevice *dev)
 {
 	struct lpc32xx_gpio_priv *gpio_priv = dev_get_priv(dev);
-	struct gpio_dev_priv *uc_priv = dev->uclass_priv;
+	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 
 	if (dev_of_offset(dev) == -1) {
 		/* Tell the uclass how many GPIOs we have */