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/serial/serial_lpuart.c b/drivers/serial/serial_lpuart.c
index 5beb5f2..a35e5be 100644
--- a/drivers/serial/serial_lpuart.c
+++ b/drivers/serial/serial_lpuart.c
@@ -138,7 +138,7 @@
 
 static bool is_lpuart32(struct udevice *dev)
 {
-	struct lpuart_serial_plat *plat = dev->plat;
+	struct lpuart_serial_plat *plat = dev_get_plat(dev);
 
 	return plat->flags & LPUART_FLAG_REGMAP_32BIT_REG;
 }
@@ -445,7 +445,7 @@
 
 static int lpuart_serial_getc(struct udevice *dev)
 {
-	struct lpuart_serial_plat *plat = dev->plat;
+	struct lpuart_serial_plat *plat = dev_get_plat(dev);
 
 	if (is_lpuart32(dev))
 		return _lpuart32_serial_getc(plat);
@@ -455,7 +455,7 @@
 
 static int lpuart_serial_putc(struct udevice *dev, const char c)
 {
-	struct lpuart_serial_plat *plat = dev->plat;
+	struct lpuart_serial_plat *plat = dev_get_plat(dev);
 
 	if (is_lpuart32(dev))
 		_lpuart32_serial_putc(plat, c);
@@ -467,7 +467,7 @@
 
 static int lpuart_serial_pending(struct udevice *dev, bool input)
 {
-	struct lpuart_serial_plat *plat = dev->plat;
+	struct lpuart_serial_plat *plat = dev_get_plat(dev);
 	struct lpuart_fsl *reg = plat->reg;
 	struct lpuart_fsl_reg32 *reg32 = plat->reg;
 	u32 stat;
@@ -513,7 +513,7 @@
 
 static int lpuart_serial_of_to_plat(struct udevice *dev)
 {
-	struct lpuart_serial_plat *plat = dev->plat;
+	struct lpuart_serial_plat *plat = dev_get_plat(dev);
 	const void *blob = gd->fdt_blob;
 	int node = dev_of_offset(dev);
 	fdt_addr_t addr;