ARM: dts: uniphier: add NAND pinmux node

This will be used to set up pin-muxing for the NAND controller.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/dts/uniphier-pinctrl.dtsi b/arch/arm/dts/uniphier-pinctrl.dtsi
index 988e60a..2d36f98 100644
--- a/arch/arm/dts/uniphier-pinctrl.dtsi
+++ b/arch/arm/dts/uniphier-pinctrl.dtsi
@@ -42,6 +42,11 @@
 		function = "i2c4";
 	};
 
+	pinctrl_nand: nand_grp {
+		groups = "nand";
+		function = "nand";
+	};
+
 	pinctrl_sd: sd_grp {
 		groups = "sd";
 		function = "sd";