dts: arm: st: h7: nucleo_stm32h723zg: add red_led

Add red led to the dts file for the nucleo_stm32h723zg.

Signed-off-by: Bartlomiej Fijal <StaryAnoda@Gmail.com>
diff --git a/boards/arm/nucleo_h723zg/nucleo_h723zg.dts b/boards/arm/nucleo_h723zg/nucleo_h723zg.dts
index 6a98ed5..0addd56 100644
--- a/boards/arm/nucleo_h723zg/nucleo_h723zg.dts
+++ b/boards/arm/nucleo_h723zg/nucleo_h723zg.dts
@@ -35,6 +35,10 @@
 			gpios = <&gpioe 1 GPIO_ACTIVE_HIGH>;
 			label = "User LD2";
 		};
+		red_led: led_2 {
+			gpios = <&gpiob 14 GPIO_ACTIVE_HIGH>;
+			label = "User LD3";
+		};
 	};
 
 	pwmleds {
@@ -57,6 +61,7 @@
 	aliases {
 		led0 = &green_led;
 		led1 = &yellow_led;
+		led2 = &red_led;
 		pwm-led0 = &red_pwm_led;
 		sw0 = &user_button;
 	};