arm64: dts: rockchip: 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 and in one instance a
value "0" is assigned probably assuming it won't be enabled as a wakeup
source. Since the presence of the boolean property indicates it is
enabled, value of "0" have no value.

This patch replaces the legacy "gpio-key,wakeup" with the unified
"wakeup-source" property which inturn fixes the above mentioned issue.
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3368-evb.dtsi

@@ -111,7 +111,7 @@ keys: gpio-keys {
 		pinctrl-0 = <&pwr_key>;
 
 		button@0 {
-			gpio-key,wakeup = <1>;
+			wakeup-source;
 			gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
 			label = "GPIO Power";
 			linux,code = <116>;

arch/arm64/boot/dts/rockchip/rk3368-r88.dts

@@ -71,7 +71,7 @@ keys: gpio-keys {
 		pinctrl-0 = <&pwr_key>;
 
 		button@0 {
-			gpio-key,wakeup = <1>;
+			wakeup-source;
 			gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
 			label = "GPIO Power";
 			linux,code = <116>;