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/chosen.txt b/doc/device-tree-bindings/chosen.txt
index e5ba672..c831254 100644
--- a/doc/device-tree-bindings/chosen.txt
+++ b/doc/device-tree-bindings/chosen.txt
@@ -129,7 +129,7 @@
 	};
 
 	fs_loader0: fs-loader@0 {
-		u-boot,dm-pre-reloc;
+		bootph-all;
 		compatible = "u-boot,fs-loader";
 		phandlepart = <&mmc 1>;
 	};