feat(stm32mp2-fdts): add SD-card and eMMC support on STM32MP257F-EV1

Add sdmmc1 node to support SD-cards on STM32MP257F-EV1 board, and
sdmmc2 node for eMMC.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I375e35aa6a96719a69df976500915be51c395b00

fdts/stm32mp257f-ev1.dts

@@ -35,6 +35,25 @@
 	};
 };
 
+&sdmmc1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&sdmmc1_b4_pins_a>;
+	st,neg-edge;
+	bus-width = <4>;
+	status = "okay";
+};
+
+&sdmmc2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&sdmmc2_b4_pins_a &sdmmc2_d47_pins_a>;
+	non-removable;
+	no-sd;
+	no-sdio;
+	st,neg-edge;
+	bus-width = <8>;
+	status = "okay";
+};
+
 &usart2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&usart2_pins_a>;