ARM: dts: aspeed: Enable IPMI BT node on OpenPower machines

These BMC systems require this device to communicate with the host.
Acked-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>

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

@@ -111,3 +111,7 @@ &i2c7 {
 &vuart {
 	status = "okay";
 };
+
+&ibt {
+	status = "okay";
+};

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

@@ -257,3 +257,7 @@ fan@6 {
 		aspeed,fan-tach-ch = /bits/ 8 <0x0e>;
 	};
 };
+
+&ibt {
+	status = "okay";
+};

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

@@ -546,3 +546,7 @@ &wdt1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_wdtrst1_default>;
 };
+
+&ibt {
+	status = "okay";
+};

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

@@ -424,3 +424,7 @@ fan@3 {
 		aspeed,fan-tach-ch = /bits/ 8 <0x03>;
 	};
 };
+
+&ibt {
+	status = "okay";
+};