Draft: WIP Kontron i.MX8MM/MP OSM-S Devicetree Improvements

CC: @akobou

arch/arm64/boot/dts/freescale/imx8mp-kontron-smarc-eval-carrier.dts

@@ -204,7 +204,7 @@ &fec {
 // 	status = "okay";
 // };
 
-// &usdhc2 {
-// 	vmmc-supply = <&reg_vdd_3v3>;
-// 	status = "okay";
-// };
+&usdhc2 {
+	vmmc-supply = <&reg_vdd_3v3>;
+	status = "okay";
+};