ARM: dts: imx28-apf28dev: add wakeup function to user button

Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@armadeus.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx28-apf28dev.dts

@@ -225,6 +225,7 @@ user-button {
 			label = "User button";
 			gpios = <&gpio0 17 GPIO_ACTIVE_LOW>;
 			linux,code = <0x100>;
+			gpio-key,wakeup;
 		};
 	};
 };