treewide: Use OF_REAL instead of !OF_PLATDATA

Now that we have a 'positive' Kconfig option, use this instead of the
negative one, which is harder to understand.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/gpio/omap_gpio.c b/drivers/gpio/omap_gpio.c
index eee3645..50c4f75 100644
--- a/drivers/gpio/omap_gpio.c
+++ b/drivers/gpio/omap_gpio.c
@@ -362,7 +362,7 @@
 	.name	= "gpio_omap",
 	.id	= UCLASS_GPIO,
 #if CONFIG_IS_ENABLED(OF_CONTROL)
-#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+#if CONFIG_IS_ENABLED(OF_REAL)
 	.of_match = omap_gpio_ids,
 	.of_to_plat = of_match_ptr(omap_gpio_of_to_plat),
 	.plat_auto	= sizeof(struct omap_gpio_plat),