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/intel_gpio.c b/drivers/gpio/intel_gpio.c
index f15ce7b..4a3ec6d 100644
--- a/drivers/gpio/intel_gpio.c
+++ b/drivers/gpio/intel_gpio.c
@@ -204,7 +204,7 @@
 #endif
 };
 
-#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+#if CONFIG_IS_ENABLED(OF_REAL)
 static const struct udevice_id intel_intel_gpio_ids[] = {
 	{ .compatible = "intel,gpio" },
 	{ }