pinctrl: rza1: Fix flag name in comment

rza1_swio_pin relates to the swio flag instead of the bidir flag.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Link: https://lore.kernel.org/r/20200507074516.29903-1-geert+renesas@glider.be

drivers/pinctrl/pinctrl-rza1.c

@@ -93,7 +93,7 @@ struct rza1_bidir_entry {
 };
 
 /**
- * rza1_swio_pin - describe a single pin that needs bidir flag applied.
+ * rza1_swio_pin - describe a single pin that needs swio flag applied.
  */
 struct rza1_swio_pin {
 	u16 pin: 4;