Draft: Enable CONFIG_SECURITY_LANDLOCK for RHEL

JIRA: https://issues.redhat.com/browse/RHEL-8810

Landlock allows unprivileged user processes to build security sandboxes. It is
used by various user-space programs so it's beneficial to enable it also for
RHEL users.

7ef47bf897fcd26508e22aea17bddfd9bc2cb925 enabled Landlock for Fedora in 2011.
4ef6502618fc7703c0e6b9ed35e4cb3a60d331a8 moved CONFIG_SECURITY_PATH to common.
This commit enables Landlock also for RHEL.

JIRA: https://issues.redhat.com/browse/RHEL-8810
Also requested by Mickaël Salaün mic@digikod.net during LPC this year.

Signed-off-by: Zbigniew Jędrzejewski-Szmek zbyszek@in.waw.pl
(cherry picked from commit d76b9b1b45f7db69367dde911c94947b7ec5d38e)
Signed-off-by: Ryan Sullivan rysulliv@redhat.com