ARM: at91/dt: gpio-keys: remove address-cells and size-cells properties

Gpio-keys nodes are not using the "reg" property in their sub nodes.
So, there is no need to define #address-cells and #size-cells properties
in gpio-keys nodes: we remove them.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/boot/dts/at91sam9263ek.dts

@@ -155,8 +155,6 @@ d2 {
 
 	gpio_keys {
 		compatible = "gpio-keys";
-		#address-cells = <1>;
-		#size-cells = <0>;
 
 		left_click {
 			label = "left_click";

arch/arm/boot/dts/at91sam9g20ek_common.dtsi

@@ -167,8 +167,6 @@ wm8731: wm8731@1b {
 
 	gpio_keys {
 		compatible = "gpio-keys";
-		#address-cells = <1>;
-		#size-cells = <0>;
 
 		btn3 {
 			label = "Button 3";

arch/arm/boot/dts/at91sam9m10g45ek.dts

@@ -162,8 +162,6 @@ d7 {
 
 	gpio_keys {
 		compatible = "gpio-keys";
-		#address-cells = <1>;
-		#size-cells = <0>;
 
 		left_click {
 			label = "left_click";

arch/arm/boot/dts/at91sam9n12ek.dts

@@ -104,8 +104,6 @@ d10 {
 
 	gpio_keys {
 		compatible = "gpio-keys";
-		#address-cells = <1>;
-		#size-cells = <0>;
 
 		enter {
 			label = "Enter";