serial: pl01x: Prepare the driver to support SPL_OF_PLATDATA

This commit prepares the pl01x serial driver to be used with
SPL_OF_PLATDATA enabled.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
diff --git a/include/dm/platform_data/serial_pl01x.h b/include/dm/platform_data/serial_pl01x.h
index e3d4e30..811697c 100644
--- a/include/dm/platform_data/serial_pl01x.h
+++ b/include/dm/platform_data/serial_pl01x.h
@@ -20,7 +20,11 @@
  * @skip_init: Don't attempt to change port configuration (also means @clock
  * is ignored)
  */
+#include <dt-structs.h>
 struct pl01x_serial_plat {
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct dtd_serial_pl01x dtplat;
+#endif
 	unsigned long base;
 	enum pl01x_type type;
 	unsigned int clock;