arm64: dts: marvell: uDPU: align LED-s with bindings

According to bindings they LED-s should be prefixed with "led" in this
use case, so fix accordingly.
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts

@@ -31,32 +31,32 @@ leds {
 		pinctrl-names = "default";
 		compatible = "gpio-leds";
 
-		power1 {
+		led-power1 {
 			label = "udpu:green:power";
 			gpios = <&gpionb 11 GPIO_ACTIVE_LOW>;
 		};
 
-		power2 {
+		led-power2 {
 			label = "udpu:red:power";
 			gpios = <&gpionb 12 GPIO_ACTIVE_LOW>;
 		};
 
-		network1 {
+		led-network1 {
 			label = "udpu:green:network";
 			gpios = <&gpionb 13 GPIO_ACTIVE_LOW>;
 		};
 
-		network2 {
+		led-network2 {
 			label = "udpu:red:network";
 			gpios = <&gpionb 14 GPIO_ACTIVE_LOW>;
 		};
 
-		alarm1 {
+		led-alarm1 {
 			label = "udpu:green:alarm";
 			gpios = <&gpionb 15 GPIO_ACTIVE_LOW>;
 		};
 
-		alarm2 {
+		led-alarm2 {
 			label = "udpu:red:alarm";
 			gpios = <&gpionb 16 GPIO_ACTIVE_LOW>;
 		};