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>

board/google/chromebook_coral/coral.c

@@ -300,7 +300,7 @@ struct sysinfo_ops coral_sysinfo_ops = {
 	.get_str	= coral_get_str,
 };
 
-#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+#if CONFIG_IS_ENABLED(OF_REAL)
 static const struct udevice_id coral_ids[] = {
 	{ .compatible = "google,coral" },
 	{ }