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/arch/x86/lib/tpl.c b/arch/x86/lib/tpl.c
index b3e5f9c..5b57e53 100644
--- a/arch/x86/lib/tpl.c
+++ b/arch/x86/lib/tpl.c
@@ -139,7 +139,7 @@
  * for devices, so the TPL BARs continue to be used. Once U-Boot starts it does
  * the auto allocation (after relocation).
  */
-#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+#if CONFIG_IS_ENABLED(OF_REAL)
 static const struct udevice_id tpl_fake_pci_ids[] = {
 	{ .compatible = "pci-x86" },
 	{ }