ARM: dts: Replace legacy *,wakeup property with wakeup-source for exynos boards

Though the keyboard and other driver will continue to support the legacy
"gpio-key,wakeup", "linux-keypad,wakeup" boolean property to enable the
wakeup source, "wakeup-source" is the new standard binding.

This patch replaces all the legacy wakeup properties with the unified
"wakeup-source" property in order to avoid any further copy-paste
duplication.

Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
diff --git a/arch/arm/boot/dts/exynos4210-universal_c210.dts b/arch/arm/boot/dts/exynos4210-universal_c210.dts
index 4f5d379..9a75e3e 100644
--- a/arch/arm/boot/dts/exynos4210-universal_c210.dts
+++ b/arch/arm/boot/dts/exynos4210-universal_c210.dts
@@ -92,7 +92,7 @@
 			linux,code = <171>;
 			label = "config";
 			debounce-interval = <1>;
-			gpio-key,wakeup;
+			wakeup-source;
 		};
 
 		camera-key {
@@ -107,7 +107,7 @@
 			linux,code = <116>;
 			label = "power";
 			debounce-interval = <1>;
-			gpio-key,wakeup;
+			wakeup-source;
 		};
 
 		ok-key {