dm: dts: Convert driver model tags to use new schema

Now that Linux has accepted these tags, move the device tree files in
U-Boot over to use them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/imx6dl-mamoj-u-boot.dtsi b/arch/arm/dts/imx6dl-mamoj-u-boot.dtsi
index 3af57ff..c37aa12 100644
--- a/arch/arm/dts/imx6dl-mamoj-u-boot.dtsi
+++ b/arch/arm/dts/imx6dl-mamoj-u-boot.dtsi
@@ -6,9 +6,9 @@
 #include "imx6qdl-u-boot.dtsi"
 
 &usdhc3 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &pinctrl_usdhc3 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };