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/imx_rgpio2p.c b/drivers/gpio/imx_rgpio2p.c
index 17edd40..a5a290a 100644
--- a/drivers/gpio/imx_rgpio2p.c
+++ b/drivers/gpio/imx_rgpio2p.c
@@ -11,6 +11,7 @@
 #include <fdtdec.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
+#include <dm/device-internal.h>
 #include <malloc.h>
 
 enum imx_rgpio2p_direction {
@@ -151,7 +152,7 @@
 
 static int imx_rgpio2p_bind(struct udevice *dev)
 {
-	struct imx_rgpio2p_plat *plat = dev->plat;
+	struct imx_rgpio2p_plat *plat = dev_get_plat(dev);
 	fdt_addr_t addr;
 
 	/*
@@ -184,7 +185,7 @@
 
 	plat->regs = (struct gpio_regs *)addr;
 	plat->bank_index = dev_seq(dev);
-	dev->plat = plat;
+	dev_set_plat(dev, plat);
 
 	return 0;
 }