ARM: dts: aspeed: Enable VHUB on Romulus

The Romulus USB bus is connected to the Power9's PCIe USB controller.

Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-opp-romulus.dts

@@ -283,3 +283,7 @@
 &ibt {
 	status = "okay";
 };
+
+&vhub {
+	status = "okay";
+};