pinctrl: renesas: Add PORT_GP_CFG_19 macros

Add PORT_GP_CFG_19() and PORT_GP_19() helper macros, to be used by the
r8a779f0 subdriver.

Based on a larger patch in the BSP by LUU HOAI.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/f7fc711d065f78911bac1b616880ba3dbc858158.1645457792.git.geert+renesas@glider.be

drivers/pinctrl/renesas/sh_pfc.h

@@ -517,9 +517,13 @@ extern const struct sh_pfc_soc_info shx3_pinmux_info;
 	PORT_GP_CFG_1(bank, 17, fn, sfx, cfg)
 #define PORT_GP_18(bank, fn, sfx)	PORT_GP_CFG_18(bank, fn, sfx, 0)
 
-#define PORT_GP_CFG_20(bank, fn, sfx, cfg)				\
+#define PORT_GP_CFG_19(bank, fn, sfx, cfg)				\
 	PORT_GP_CFG_18(bank, fn, sfx, cfg),				\
-	PORT_GP_CFG_1(bank, 18, fn, sfx, cfg),				\
+	PORT_GP_CFG_1(bank, 18, fn, sfx, cfg)
+#define PORT_GP_19(bank, fn, sfx)	PORT_GP_CFG_19(bank, fn, sfx, 0)
+
+#define PORT_GP_CFG_20(bank, fn, sfx, cfg)				\
+	PORT_GP_CFG_19(bank, fn, sfx, cfg),				\
 	PORT_GP_CFG_1(bank, 19, fn, sfx, cfg)
 #define PORT_GP_20(bank, fn, sfx)	PORT_GP_CFG_20(bank, fn, sfx, 0)