arm: socfpga: Fix SD/MMC boot on ArriaV SoCDK

Add the missing DT nodes, so that ArriaV SoCDK can boot from SD
card. The SD card must be in slot J5 and BSEL must be 0x5.

Signed-off-by: Marek Vasut <marex@denx.de>

arch/arm/dts/socfpga_arria5_socdk.dts

@@ -33,6 +33,10 @@
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 	};
+
+	soc {
+		u-boot,dm-pre-reloc;
+	};
 };
 
 &gmac1 {
@@ -67,6 +71,8 @@
 &mmc0 {
 	vmmc-supply = <&regulator_3_3v>;
 	vqmmc-supply = <&regulator_3_3v>;
+	bus-width = <4>;
+	u-boot,dm-pre-reloc;
 };
 
 &usb1 {