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/ast2500-evb.dts b/arch/arm/dts/ast2500-evb.dts
index 1fbacf9..d481ead 100644
--- a/arch/arm/dts/ast2500-evb.dts
+++ b/arch/arm/dts/ast2500-evb.dts
@@ -19,7 +19,7 @@
 };
 
 &uart5 {
-	u-boot,dm-pre-reloc;
+	bootph-all;
 	status = "okay";
 };
 
@@ -28,17 +28,17 @@
 };
 
 &wdt1 {
-	u-boot,dm-pre-reloc;
+	bootph-all;
 	status = "okay";
 };
 
 &wdt2 {
-	u-boot,dm-pre-reloc;
+	bootph-all;
 	status = "okay";
 };
 
 &wdt3 {
-	u-boot,dm-pre-reloc;
+	bootph-all;
 	status = "okay";
 };