mx6cuboxi: enable MMC and eMMC in DT for SPL

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>
diff --git a/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi b/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
index d302b2e..400b885 100644
--- a/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
+++ b/arch/arm/dts/imx6qdl-hummingboard2-emmc-som-v15-u-boot.dtsi
@@ -34,3 +34,11 @@
 &usdhc1 {
 	status = "disabled";
 };
+
+&usdhc2 {
+	u-boot,dm-pre-reloc;
+};
+
+&usdhc3 {
+	u-boot,dm-pre-reloc;
+};