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>

drivers/clk/clk_fixed_factor.c

@@ -40,7 +40,7 @@ const struct clk_ops clk_fixed_factor_ops = {
 
 static int clk_fixed_factor_of_to_plat(struct udevice *dev)
 {
-#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+#if CONFIG_IS_ENABLED(OF_REAL)
 	int err;
 	struct clk_fixed_factor *ff = to_clk_fixed_factor(dev);