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-colibri-eval-v3-u-boot.dtsi b/arch/arm/dts/imx6dl-colibri-eval-v3-u-boot.dtsi
index c4e8d0f..31f3a48 100644
--- a/arch/arm/dts/imx6dl-colibri-eval-v3-u-boot.dtsi
+++ b/arch/arm/dts/imx6dl-colibri-eval-v3-u-boot.dtsi
@@ -16,5 +16,5 @@
 
 &wdog1 {
 	status = "okay";
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };