ARM: dts: add gpio_poweroff support for Iomega ix2-200

Iomega ix2-200 can be powered off via GPIO 0 pin 17,
this patch wires up the gpio-poweroff driver to do it.
Signed-off-by: Richard Kunze <richard.kunze@web.de>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>

arch/arm/boot/dts/kirkwood-iomega_ix2_200.dts

@@ -169,6 +169,10 @@ OTB {
 			gpios = <&gpio1 3 GPIO_ACTIVE_LOW>;
 		};
 	};
+	gpio-poweroff {
+		compatible = "gpio-poweroff";
+		gpios = <&gpio0 17 GPIO_ACTIVE_LOW>;
+	};
 };
 
 &nand {