ARM: DTS: stm32: add SDMMC support fo stm32h743-eval

Add pinctrl and sdmmc nodes to add MMC support for
STM32H743 evaluation board.

Evaluation board needs a second pinctrl node
"pinctrl_sdmmc1_level_shifter" to drive a level shifter
on MMC bus.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

arch/arm/dts/stm32h743-pinctrl.dtsi

@@ -259,6 +259,17 @@
 					bias-disable;
 				};
 			};
+
+			pinctrl_sdmmc1_level_shifter: sdmmc0_ls@0 {
+				pins {
+					pinmux = <STM32H7_PB8_FUNC_SDMMC1_CKIN>,
+						 <STM32H7_PB9_FUNC_SDMMC1_CDIR>,
+						 <STM32H7_PC6_FUNC_SDMMC1_D0DIR>,
+						 <STM32H7_PC7_FUNC_SDMMC1_D123DIR>;
+					drive-push-pull;
+					slew-rate = <3>;
+				};
+			};
 		};
 	};
 };

arch/arm/dts/stm32h743i-eval.dts

@@ -98,3 +98,12 @@
 		st,sdram-refcount = <1539>;
 	};
 };
+
+&sdmmc1 {
+	status = "okay";
+	pinctrl-0 = <&sdmmc1_pins>,
+		    <&pinctrl_sdmmc1_level_shifter>;
+	pinctrl-names = "default";
+	bus-width = <4>;
+	st,dirpol;
+};