dm: doc: Update device tree binding docs for new schema

Now that Linux has accepted these tags, move U-Boot over to use them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/device-tree-bindings/pinctrl/nexell,s5pxx18-pinctrl.txt b/doc/device-tree-bindings/pinctrl/nexell,s5pxx18-pinctrl.txt
index 115ab53..38e322d 100644
--- a/doc/device-tree-bindings/pinctrl/nexell,s5pxx18-pinctrl.txt
+++ b/doc/device-tree-bindings/pinctrl/nexell,s5pxx18-pinctrl.txt
@@ -20,7 +20,7 @@
 pinctrl_0: pinctrl@c0010000 {
 	compatible = "nexell,s5pxx18-pinctrl";
 		reg = <0xc0010000 0xf000>;
-		u-boot,dm-pre-reloc;
+		bootph-all;
 };
 
 Nexell's pin configuration nodes act as a container for an arbitrary number of