ARM: dts: stm32: Add usart2_pins on stm32h743

Add usart2 pins definition in order to add usart2 support
dedicated for console output on stm32h743i-disco board.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32h743-pinctrl.dtsi

@@ -151,6 +151,19 @@ pins2 {
 					bias-disable;
 				};
 			};
+
+			usart2_pins: usart2@0 {
+				pins1 {
+					pinmux = <STM32H7_PD5_FUNC_USART2_TX>;
+					bias-disable;
+					drive-push-pull;
+					slew-rate = <0>;
+				};
+				pins2 {
+					pinmux = <STM32H7_PD6_FUNC_USART2_RX>;
+					bias-disable;
+				};
+			};
 		};
 	};
 };