ARM: dts: stm32: Add red LED for stm32mp157c-ed1 board

Add led-red node for stm32mp157c-ed1.
This LED is used as status LED in U-Boot.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Link: https://lore.kernel.org/r/20251113-upstream_update_led_nodes-v2-12-45090db9e2e5@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

Author: Patrice Chotard

arch/arm/boot/dts/st/stm32mp157c-ed1.dts

@@ -81,6 +81,12 @@
 			function = LED_FUNCTION_HEARTBEAT;
 			color = <LED_COLOR_ID_BLUE>;
 		};
+
+		led-red {
+			function = LED_FUNCTION_STATUS;
+			color = <LED_COLOR_ID_RED>;
+			gpios = <&gpioa 13 GPIO_ACTIVE_LOW>;
+		};
 	};
 
 	sd_switch: regulator-sd_switch {