arm: socfpga: Make /soc available in pre-reloc

This node must be available before relocation, otherwise the board
will not find mmc and will thus not boot.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>

arch/arm/dts/socfpga_cyclone5_socdk.dts

@@ -34,6 +34,10 @@
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 	};
+
+	soc {
+		u-boot,dm-pre-reloc;
+	};
 };
 
 &gmac1 {