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/riscv/dts/ae350-u-boot.dtsi b/arch/riscv/dts/ae350-u-boot.dtsi
index 7011f59..aef9159 100644
--- a/arch/riscv/dts/ae350-u-boot.dtsi
+++ b/arch/riscv/dts/ae350-u-boot.dtsi
@@ -2,51 +2,51 @@
 
 / {
 	cpus {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 		CPU0: cpu@0 {
-			u-boot,dm-spl;
+			bootph-pre-ram;
 			CPU0_intc: interrupt-controller {
-				u-boot,dm-spl;
+				bootph-pre-ram;
 			};
 		};
 		CPU1: cpu@1 {
-			u-boot,dm-spl;
+			bootph-pre-ram;
 			CPU1_intc: interrupt-controller {
-				u-boot,dm-spl;
+				bootph-pre-ram;
 			};
 		};
 		CPU2: cpu@2 {
-			u-boot,dm-spl;
+			bootph-pre-ram;
 			CPU2_intc: interrupt-controller {
-				u-boot,dm-spl;
+				bootph-pre-ram;
 			};
 		};
 		CPU3: cpu@3 {
-			u-boot,dm-spl;
+			bootph-pre-ram;
 			CPU3_intc: interrupt-controller {
-				u-boot,dm-spl;
+				bootph-pre-ram;
 			};
 		};
 	};
 
 	memory@0 {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 	};
 
 	soc {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 
 		plicsw: interrupt-controller@e6400000 {
-			u-boot,dm-spl;
+			bootph-pre-ram;
 		};
 
 		plmt0@e6000000 {
-			u-boot,dm-spl;
+			bootph-pre-ram;
 		};
 	};
 
 	serial0: serial@f0300000 {
-		u-boot,dm-spl;
+		bootph-pre-ram;
 	};
 
 };