ARM: uniphier: dts: sync with Linux 4.20

Currently, the DWC3 USB node is out of sync because the bindings
for the UniPhier DWC3 PHY diverged between Linux and U-Boot.

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 aeb47b0..1fee5ff 100644
--- a/arch/arm/dts/uniphier-pinctrl.dtsi
+++ b/arch/arm/dts/uniphier-pinctrl.dtsi
@@ -131,6 +131,26 @@
 		function = "sd1";
 	};
 
+	pinctrl_spi0: spi0 {
+		groups = "spi0";
+		function = "spi0";
+	};
+
+	pinctrl_spi1: spi1 {
+		groups = "spi1";
+		function = "spi1";
+	};
+
+	pinctrl_spi2: spi2 {
+		groups = "spi2";
+		function = "spi2";
+	};
+
+	pinctrl_spi3: spi3 {
+		groups = "spi3";
+		function = "spi3";
+	};
+
 	pinctrl_system_bus: system-bus {
 		groups = "system_bus", "system_bus_cs1";
 		function = "system_bus";