ARM: dts: armada: replace isil, irq2-can-wakeup-machine with wakeup-source property

Though the driver will continue to check for and support the legacy
"isil,irq2-can-wakeup-machine" boolean property to wakeup source,
"wakeup-source" is the new standard binding.

This patch replaces the legacy "isil,irq2-can-wakeup-machine" with the
unified "wakeup-source" property in order to avoid any futher copy-paste
duplication.

Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Gregory Clement <gregory.clement@free-electrons.com>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/armada-370-netgear-rn102.dts

@@ -127,7 +127,7 @@ i2c@11000 {
 				isl12057: isl12057@68 {
 					compatible = "isil,isl12057";
 					reg = <0x68>;
-					isil,irq2-can-wakeup-machine;
+					wakeup-source;
 				};
 
 				g762: g762@3e {

arch/arm/boot/dts/armada-370-netgear-rn104.dts

@@ -133,7 +133,7 @@ i2c@11000 {
 				isl12057: isl12057@68 {
 					compatible = "isil,isl12057";
 					reg = <0x68>;
-					isil,irq2-can-wakeup-machine;
+					wakeup-source;
 				};
 
 				g762: g762@3e {

arch/arm/boot/dts/armada-xp-netgear-rn2120.dts

@@ -141,7 +141,7 @@ g751: g751@4c {
 				isl12057: isl12057@68 {
 					compatible = "isil,isl12057";
 					reg = <0x68>;
-					isil,irq2-can-wakeup-machine;
+					wakeup-source;
 				};
 			};