ARM: dts: fixed gpio key node for exynos4412-trats2

This patch fixed gpio key device node.
First, fix incorrect gpio property.
And then, add ok-key node where locate bottom center.
I have tested on exynos4412-trats2 board.
Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos4412-trats2.dts

@@ -114,32 +114,34 @@ gpio-keys {
 		compatible = "gpio-keys";
 
 		key-down {
-			interrupt-parent = <&gpj1>;
-			interrupts = <2 0>;
-			gpios = <&gpj1 2 1>;
+			gpios = <&gpx3 3 1>;
 			linux,code = <114>;
 			label = "volume down";
 			debounce-interval = <10>;
 		};
 
 		key-up {
-			interrupt-parent = <&gpj1>;
-			interrupts = <1 0>;
-			gpios = <&gpj1 1 1>;
+			gpios = <&gpx2 2 1>;
 			linux,code = <115>;
 			label = "volume up";
 			debounce-interval = <10>;
 		};
 
 		key-power {
-			interrupt-parent = <&gpx2>;
-			interrupts = <7 0>;
 			gpios = <&gpx2 7 1>;
 			linux,code = <116>;
 			label = "power";
 			debounce-interval = <10>;
 			gpio-key,wakeup;
 		};
+
+		key-ok {
+			gpios = <&gpx0 1 1>;
+			linux,code = <139>;
+			label = "ok";
+			debounce-inteval = <10>;
+			gpio-key,wakeup;
+		};
 	};
 
 	adc: adc@126C0000 {