ARM: mvebu: use input DT defines in Armada 370/XP boards

Instead of harcoding keycodes specifications in the Armada 370/XP
boards, use the <dt-bindings/input/input.h> header file and its
keycode definitions.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

arch/arm/boot/dts/armada-370-rd.dts

@@ -12,6 +12,7 @@
  */
 
 /dts-v1/;
+#include <dt-bindings/input/input.h>
 #include <dt-bindings/gpio/gpio.h>
 #include "armada-370.dtsi"
 
@@ -101,7 +102,7 @@ gpio-keys {
 				#size-cells = <0>;
 				button@1 {
 					label = "Software Button";
-					linux,code = <116>;
+					linux,code = <KEY_POWER>;
 					gpios = <&gpio0 6 GPIO_ACTIVE_LOW>;
 				};
 			};

arch/arm/boot/dts/armada-xp-axpwifiap.dts

@@ -17,6 +17,7 @@
 
 /dts-v1/;
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include "armada-xp-mv78230.dtsi"
 
 / {
@@ -158,7 +159,7 @@ gpio_keys {
 
 		button@1 {
 			label = "Factory Reset Button";
-			linux,code = <141>; /* KEY_SETUP */
+			linux,code = <KEY_SETUP>;
 			gpios = <&gpio1 1 GPIO_ACTIVE_LOW>;
 		};
 	};

arch/arm/boot/dts/armada-xp-openblocks-ax3-4.dts

@@ -12,6 +12,7 @@
 
 /dts-v1/;
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
 #include "armada-xp-mv78260.dtsi"
 
 / {
@@ -115,7 +116,7 @@ gpio_keys {
 
 				button@1 {
 					label = "Init Button";
-					linux,code = <116>;
+					linux,code = <KEY_POWER>;
 					gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
 				};
 			};