ARM: dts: aspeed: romulus: Add UART1

Romulus has a RS-232 connection on the back of chassis, add UART1 to use
this connection.
Signed-off-by: Lei YU <mine260309@gmail.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>

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

@@ -52,6 +52,21 @@ flash@0 {
 	};
 };
 
+&uart1 {
+	/* Rear RS-232 connector */
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_txd1_default
+			&pinctrl_rxd1_default
+			&pinctrl_nrts1_default
+			&pinctrl_ndtr1_default
+			&pinctrl_ndsr1_default
+			&pinctrl_ncts1_default
+			&pinctrl_ndcd1_default
+			&pinctrl_nri1_default>;
+};
+
 &uart5 {
 	status = "okay";
 };