fix(stm32mp2-fdts): move stm32mp25 dk board on new SDMMC1 slew rate

Move stm32mp25 dk board on new SDMMC1 slew rate.

Change-Id: Ifa8ac2794fdb1b8f3f2a91a7bd99e0382aebd99b
Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Signed-off-by: Amit Mittal <amit.mittal@st.com>

Author: Christophe Kerello

fdts/stm32mp257f-dk.dts

@@ -199,7 +199,7 @@
 
 &sdmmc1 {
 	pinctrl-names = "default";
-	pinctrl-0 = <&sdmmc1_b4_pins_a>;
+	pinctrl-0 = <&sdmmc1_b4_pins_b>;
 	st,neg-edge;
 	bus-width = <4>;
 	vmmc-supply = <&vdd_sdcard>;