ARM: Kirkwood: Convert DNSKW to use gpio-poweroff.

Also enable the gpio-poweroff driver when DT is used.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
diff --git a/arch/arm/boot/dts/kirkwood-dnskw.dtsi b/arch/arm/boot/dts/kirkwood-dnskw.dtsi
index fd23e63..28263a1 100644
--- a/arch/arm/boot/dts/kirkwood-dnskw.dtsi
+++ b/arch/arm/boot/dts/kirkwood-dnskw.dtsi
@@ -35,6 +35,11 @@
 				      6000 2>;
 	};
 
+	gpio_poweroff {
+		compatible = "gpio-poweroff";
+		gpios = <&gpio1 4 0>;
+	};
+
 	ocp@f1000000 {
 		sata@80000 {
 			status = "okay";