ARM: dts: stm32: Update red led node for stm32mp157c-ed1-u-boot

As indicated in kernel led dt-bindings, label is a deprecated
property, so remove it and use led node's name instead for
u-boot,error-led property.
Rename red led node's name to led-red.
Remove status property which is useless.
Add compatible = "gpio-leds" which is not present in kernel DT.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>

arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi

@@ -15,7 +15,7 @@
 
 	config {
 		u-boot,boot-led = "heartbeat";
-		u-boot,error-led = "error";
+		u-boot,error-led = "led-red";
 		u-boot,mmc-env-partition = "fip";
 	};
 
@@ -59,10 +59,10 @@
 	};
 
 	led {
-		red {
-			label = "error";
+		compatible = "gpio-leds";
+
+		led-red {
 			gpios = <&gpioa 13 GPIO_ACTIVE_LOW>;
-			status = "okay";
 		};
 	};
 };