ARM: at91: dt: switch to standard GPIO flag defines.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/boot/dts/mpa1600.dts b/arch/arm/boot/dts/mpa1600.dts
index f1b54a2..ccf9ea2 100644
--- a/arch/arm/boot/dts/mpa1600.dts
+++ b/arch/arm/boot/dts/mpa1600.dts
@@ -62,7 +62,7 @@
 
 		monitor_mute {
 			label = "Monitor mute";
-			gpios = <&pioC 1 1>;
+			gpios = <&pioC 1 GPIO_ACTIVE_LOW>;
 			linux,code = <113>;
 		};
 	};