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/imx6ul-geam-u-boot.dtsi b/arch/arm/dts/imx6ul-geam-u-boot.dtsi
index 3141a07..014b6bd 100644
--- a/arch/arm/dts/imx6ul-geam-u-boot.dtsi
+++ b/arch/arm/dts/imx6ul-geam-u-boot.dtsi
@@ -6,19 +6,19 @@
 #include "imx6ul-u-boot.dtsi"
 
 &usdhc1 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &iomuxc {
 	pinctrl_usdhc1: usdhc1grp {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 	};
 
 	pinctrl_usdhc1_100mhz: usdhc1grp100mhz {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 	};
 
 	pinctrl_usdhc1_200mhz: usdhc1grp200mhz {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 	};
 };