treewide: Simply conditions with the new OF_REAL

Use this new Kconfig to simplify the compilation conditions where
appropriate.

Signed-off-by: Simon Glass <sjg@chromium.org>

common/spl/spl.c

@@ -489,7 +489,7 @@ static int spl_common_init(bool setup_malloc)
 		return ret;
 	}
 #endif
-	if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
+	if (CONFIG_IS_ENABLED(OF_REAL)) {
 		ret = fdtdec_setup();
 		if (ret) {
 			debug("fdtdec_setup() returned error %d\n", ret);