ARM: dts: use macro in gpio keys for exynos3250 boards

This patch replaces number by macro in gpio keys for exynos3250 boards.

Cc: Youngjun Cho <yj44.cho@samsung.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

arch/arm/boot/dts/exynos3250-monk.dts

@@ -15,6 +15,7 @@
 /dts-v1/;
 #include "exynos3250.dtsi"
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
 
 / {
 	model = "Samsung Monk board";
@@ -37,7 +38,7 @@ gpio_keys {
 		compatible = "gpio-keys";
 
 		power_key {
-			gpios = <&gpx2 7 1>;
+			gpios = <&gpx2 7 GPIO_ACTIVE_LOW>;
 			linux,code = <KEY_POWER>;
 			label = "power key";
 			debounce-interval = <10>;

arch/arm/boot/dts/exynos3250-rinato.dts

@@ -15,6 +15,7 @@
 /dts-v1/;
 #include "exynos3250.dtsi"
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/gpio/gpio.h>
 
 / {
 	model = "Samsung Rinato board";
@@ -37,7 +38,7 @@ gpio_keys {
 		compatible = "gpio-keys";
 
 		power_key {
-			gpios = <&gpx2 7 1>;
+			gpios = <&gpx2 7 GPIO_ACTIVE_LOW>;
 			linux,code = <KEY_POWER>;
 			label = "power key";
 			debounce-interval = <10>;