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/imx8mm-icore-mx8mm-edimm2.2-u-boot.dtsi b/arch/arm/dts/imx8mm-icore-mx8mm-edimm2.2-u-boot.dtsi
index 8b67bcf..a009880 100644
--- a/arch/arm/dts/imx8mm-icore-mx8mm-edimm2.2-u-boot.dtsi
+++ b/arch/arm/dts/imx8mm-icore-mx8mm-edimm2.2-u-boot.dtsi
@@ -7,25 +7,25 @@
 #include "imx8mm-icore-mx8mm-u-boot.dtsi"
 
 &gpio1 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &pinctrl_uart2 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &pinctrl_usdhc1_gpio {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &pinctrl_usdhc1 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &uart2 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &usdhc1 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };