pinctrl: uniphier: set PUPD_SIMPLE cap flag for PXs3

Like other recenct UniPhier SoCs, the pupdctrl number of PXs3
matches to the pin number.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/pinctrl/uniphier/pinctrl-uniphier-pxs3.c b/drivers/pinctrl/uniphier/pinctrl-uniphier-pxs3.c
index 423e48b..7c54d37 100644
--- a/drivers/pinctrl/uniphier/pinctrl-uniphier-pxs3.c
+++ b/drivers/pinctrl/uniphier/pinctrl-uniphier-pxs3.c
@@ -118,7 +118,8 @@
 	.groups_count = ARRAY_SIZE(uniphier_pxs3_groups),
 	.functions = uniphier_pxs3_functions,
 	.functions_count = ARRAY_SIZE(uniphier_pxs3_functions),
-	.caps = UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL,
+	.caps = UNIPHIER_PINCTRL_CAPS_PUPD_SIMPLE |
+		UNIPHIER_PINCTRL_CAPS_PERPIN_IECTRL,
 };
 
 static int uniphier_pxs3_pinctrl_probe(struct udevice *dev)