dm: core: Add a way to delete a node

Add a function to delete a node in an existing tree.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index 7eb04ac..f1ee02c 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -1635,4 +1635,17 @@
 int ofnode_copy_node(ofnode dst_parent, const char *name, ofnode src,
 		     ofnode *nodep);
 
+/**
+ * ofnode_delete() - Delete a node
+ *
+ * Delete a node from the tree
+ *
+ * @nodep: Pointer to node to delete (set to ofnode_null() on success)
+ * Return: 0 if OK, -ENOENT if the node does not exist, -EPERM if it is the root
+ * node (wWhich cannot be removed), -EFAULT if the tree is broken (to_remove is
+ * not a child of its parent),
+ *
+ */
+int ofnode_delete(ofnode *nodep);
+
 #endif