arm: dts: socfpga: add "u-boot,dm-pre-reloc" to socfpga_cyclone5_socdk dts

We need "u-boot,dm-pre-reloc" in the socfpga_cyclone5_socdk.dts file in
order for the SPL to use SD/MMC.
Signed-off-by: NDinh Nguyen <dinguyen@opensource.altera.com>

arch/arm/dts/socfpga_cyclone5_socdk.dts

@@ -69,6 +69,9 @@
 };
 
 &mmc0 {
+	status = "okay";
+	u-boot,dm-pre-reloc;
+
 	cd-gpios = <&portb 18 0>;
 	vmmc-supply = <&regulator_3_3v>;
 	vqmmc-supply = <&regulator_3_3v>;