arm: socfpga: make socfpga_socrates_defconfig boot from QSPI

This fixes the board's dts to supply SPL with QSPI info.

The EBV Socrates board has DIP switches to boot from SD card or
QSPI, so let's fix its defconfig to work for both cases.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
diff --git a/arch/arm/dts/socfpga_cyclone5_socrates.dts b/arch/arm/dts/socfpga_cyclone5_socrates.dts
index 8d5d399..93c3fa4 100644
--- a/arch/arm/dts/socfpga_cyclone5_socrates.dts
+++ b/arch/arm/dts/socfpga_cyclone5_socrates.dts
@@ -76,6 +76,7 @@
 
 &qspi {
 	status = "okay";
+	u-boot,dm-pre-reloc;
 
 	flash: flash@0 {
 		#address-cells = <1>;
@@ -90,5 +91,6 @@
 		cdns,tchsh-ns = <4>;
 		cdns,tslch-ns = <4>;
 		status = "okay";
+		u-boot,dm-pre-reloc;
 	};
 };