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/core/simple-bus.c b/drivers/core/simple-bus.c
index abc55c2..6022e75 100644
--- a/drivers/core/simple-bus.c
+++ b/drivers/core/simple-bus.c
@@ -65,7 +65,7 @@
 	.per_device_plat_auto	= sizeof(struct simple_bus_plat),
 };
 
-#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+#if CONFIG_IS_ENABLED(OF_REAL)
 static const struct udevice_id generic_simple_bus_ids[] = {
 	{ .compatible = "simple-bus" },
 	{ .compatible = "simple-mfd" },