dm: treewide: Rename ..._platdata variables to just ..._plat

Try to maintain some consistency between these variables by using _plat as
a suffix for them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/gpio/at91_gpio.c b/drivers/gpio/at91_gpio.c
index 7b604e4..1409db5 100644
--- a/drivers/gpio/at91_gpio.c
+++ b/drivers/gpio/at91_gpio.c
@@ -590,7 +590,7 @@
 static int at91_gpio_probe(struct udevice *dev)
 {
 	struct at91_port_priv *port = dev_get_priv(dev);
-	struct at91_port_platdata *plat = dev_get_plat(dev);
+	struct at91_port_plat *plat = dev_get_plat(dev);
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 	struct clk clk;
 	int ret;
@@ -629,7 +629,7 @@
 	.id	= UCLASS_GPIO,
 #if CONFIG_IS_ENABLED(OF_CONTROL)
 	.of_match = at91_gpio_ids,
-	.plat_auto	= sizeof(struct at91_port_platdata),
+	.plat_auto	= sizeof(struct at91_port_plat),
 #endif
 	.ops	= &gpio_at91_ops,
 	.probe	= at91_gpio_probe,