bcachefs: drop unused posix acl handlers

bcachefs: drop unused posix acl handlers

Remove struct nop_posix_acl_{access,default} for bcachefs filesystem
that don't depend on the xattr handler in their inode->i_op->listxattr()
method in any way. There's nothing more to do than to simply remove the
handler. It's been effectively unused ever since we introduced the new
posix acl api. See [1] for details.

Link [1]: https://patchwork.kernel.org/project/linux-fsdevel/cover/20230125-fs-acl-remove-generic-xattr-handlers-v3-0-f760cc58967d@kernel.org/

Signed-off-by: Youling Tang <tangyouling@kylinos.cn>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>