dm: remove superfluous comment for union ofnode_union

"future live tree" does not make sense anymore as we have CONFIG_OF_LIVE.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index a0d3df7..8df2fac 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -48,7 +48,7 @@
  *	is not a really a pointer to a node: it is an offset value. See above.
  */
 typedef union ofnode_union {
-	const struct device_node *np;	/* will be used for future live tree */
+	const struct device_node *np;
 	long of_offset;
 } ofnode;