ARM: dts: Migrate U-boot nodes to U-boot DT files for stm32h7

In order to prepare and ease future DT synchronization with kernel
DT, migrate all U-boot specific nodes/properties/addons to
U-boot DT files.

As sdmmc is not yet supported on kernel side, sdmmc nodes
are located in eval-u-boot and disco-u-boot DT files.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/arch/arm/dts/stm32h743i-disco-u-boot.dtsi b/arch/arm/dts/stm32h743i-disco-u-boot.dtsi
new file mode 100644
index 0000000..2d6b41b
--- /dev/null
+++ b/arch/arm/dts/stm32h743i-disco-u-boot.dtsi
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <stm32h7-u-boot.dtsi>
+
+&sdmmc1 {
+	status = "okay";
+	pinctrl-0 = <&sdmmc1_pins>;
+	pinctrl-names = "default";
+	bus-width = <4>;
+	cd-gpios = <&gpioi 8 1>;
+};