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/rk3308-evb-u-boot.dtsi b/arch/arm/dts/rk3308-evb-u-boot.dtsi
index c6ea746..d15ba94 100644
--- a/arch/arm/dts/rk3308-evb-u-boot.dtsi
+++ b/arch/arm/dts/rk3308-evb-u-boot.dtsi
@@ -11,7 +11,7 @@
 };
 
 &uart4 {
-	u-boot,dm-pre-reloc;
+	bootph-all;
 	clock-frequency = <24000000>;
 	status = "okay";
 };