landlock: Optimize scope enforcement

Do not walk through the domain hierarchy when the required scope is not
supported by this domain.  This is the same approach as for filesystem
and network restrictions.

Cc: Mikhail Ivanov <ivanov.mikhail1@huawei-partners.com>
Cc: Tahera Fahimi <fahimitahera@gmail.com>
Reviewed-by: Günther Noack <gnoack@google.com>
Link: https://lore.kernel.org/r/20241109110856.222842-4-mic@digikod.net


Signed-off-by: Mickaël Salaün <mic@digikod.net>