udf: Provide function to mark entry as deleted using new directory iteration code

[ Upstream commit 4cca7e3d ]

Provide function udf_fiiter_delete_entry() to mark directory entry as
deleted using new directory iteration code.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>