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/imx8mn-beacon-kit-u-boot.dtsi b/arch/arm/dts/imx8mn-beacon-kit-u-boot.dtsi
index 3180d57..4be0098 100644
--- a/arch/arm/dts/imx8mn-beacon-kit-u-boot.dtsi
+++ b/arch/arm/dts/imx8mn-beacon-kit-u-boot.dtsi
@@ -6,23 +6,23 @@
 #include "imx8mn-u-boot.dtsi"
 
 &{/soc@0/bus@30800000/i2c@30a20000/pmic@4b} {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &{/soc@0/bus@30800000/i2c@30a20000/pmic@4b/regulators} {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &gpio1 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &gpio2 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &i2c1 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &pca6416_0 {
@@ -34,27 +34,27 @@
 };
 
 &pinctrl_i2c1 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &pinctrl_pmic {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &pinctrl_uart2 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &pinctrl_usdhc2_gpio {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &pinctrl_usdhc2 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &pinctrl_usdhc3 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &reg_usdhc2_vmmc {
@@ -62,27 +62,27 @@
 };
 
 &uart2 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &usdhc1 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 	sd-uhs-sdr104;
 	sd-uhs-ddr50;
 };
 
 &usdhc2 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 	sd-uhs-sdr104;
 	sd-uhs-ddr50;
 };
 
 &usdhc3 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 	mmc-hs400-1_8v;
 	mmc-hs400-enhanced-strobe;
 };
 
 &pinctrl_wdog {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };