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/r8a7791-porter-u-boot.dts b/arch/arm/dts/r8a7791-porter-u-boot.dts
index 82051be..bfec1fc 100644
--- a/arch/arm/dts/r8a7791-porter-u-boot.dts
+++ b/arch/arm/dts/r8a7791-porter-u-boot.dts
@@ -9,7 +9,7 @@
 #include "r8a7791-u-boot.dtsi"
 
 &scif0 {
-	u-boot,dm-pre-reloc;
+	bootph-all;
 };
 
 &i2c6 {