ARM: dts: spear: replace gpio-key,wakeup with wakeup-source property

Keyboard driver for GPIO buttons(gpio-keys) checks for the legacy
"gpio-key,wakeup" boolean property to enable gpio buttons as wakeup
source.

Few dts files assign value "1" to gpio-key,wakeup which is incorrect.
Since the presence of the boolean property indicates it is enabled,
value of "0" or "1" have no significance.

This patch replaces the legacy "gpio-key,wakeup" with the unified
"wakeup-source" property which inturn fixes the above mentioned issue.
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/boot/dts/spear1310-evb.dts

@@ -161,7 +161,7 @@ button@1 {
 				linux,code = <0x100>;
 				gpios = <&gpio0 7 0x4>;
 				debounce-interval = <20>;
-				gpio-key,wakeup = <1>;
+				wakeup-source;
 			};
 		};
 

arch/arm/boot/dts/spear1340-evb.dts

@@ -223,7 +223,7 @@ button@1 {
 				linux,code = <0x100>;
 				gpios = <&gpio1 1 0x4>;
 				debounce-interval = <20>;
-				gpio-key,wakeup = <1>;
+				wakeup-source;
 			};
 		};
 

arch/arm/boot/dts/spear320-hmi.dts

@@ -141,7 +141,7 @@ button@1 {
 				linux,code = <0x100>;
 				gpios = <&stmpegpio 3 0x4>;
 				debounce-interval = <20>;
-				gpio-key,wakeup = <1>;
+				wakeup-source;
 			};
 
 			button@2 {
@@ -149,7 +149,7 @@ button@2 {
 				linux,code = <0x200>;
 				gpios = <&stmpegpio 2 0x4>;
 				debounce-interval = <20>;
-				gpio-key,wakeup = <1>;
+				wakeup-source;
 			};
 		};