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-ld20-global.dts b/arch/arm/dts/uniphier-ld20-global.dts
index 1a5e7c2..9ca692e 100644
--- a/arch/arm/dts/uniphier-ld20-global.dts
+++ b/arch/arm/dts/uniphier-ld20-global.dts
@@ -145,6 +145,10 @@
 	};
 };
 
+&usb {
+	status = "okay";
+};
+
 &nand {
 	status = "okay";
 };