[PATCH] MAINTAINERS: add an entry for the lockdown LSM

[Matthew Garrett]

On Mon, Nov 20, 2023 at 04:59:18PM -0500, Paul Moore wrote:
> While lockdown has been present in the kernel for a while, it is
> missing a MAINTAINERS entry for some reason.
> 
> Cc: Matthew Garrett <mjg59 at srcf.ucam.org>
> Signed-off-by: Paul Moore <paul at paul-moore.com>

Signed-off-by: Matthew Garrett <mjg59 at srcf.ucam.org>