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/stm32mp157c-ev1-u-boot.dtsi b/arch/arm/dts/stm32mp157c-ev1-u-boot.dtsi
index 7bf08be..cb32c30 100644
--- a/arch/arm/dts/stm32mp157c-ev1-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp157c-ev1-u-boot.dtsi
@@ -22,37 +22,37 @@
 };
 
 &flash0 {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &qspi {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 };
 
 &qspi_clk_pins_a {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 	pins {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 	};
 };
 
 &qspi_bk1_pins_a {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 	pins1 {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 	};
 	pins2 {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 	};
 };
 
 &qspi_bk2_pins_a {
-	u-boot,dm-spl;
+	bootph-pre-ram;
 	pins1 {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 	};
 	pins2 {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 	};
 };