ANDROID: GKI: Enable Landlock support

Landlock is a sandboxing mechanism that enables processes to restrict
themselves (and their future children) by gradually enforcing
tailored access control policies.  A Landlock security policy is a
set of access rights (e.g. open a file in read-only, make a
directory, etc.) tied to a file hierarchy.  Such policy can be
configured and enforced by any processes for themselves using the
dedicated system calls: landlock_create_ruleset(),
landlock_add_rule(), and landlock_restrict_self().

See Documentation/userspace-api/landlock.rst for further information.

Bug: 391769036
Change-Id: I92441cad601dba27233d8bb87d388bc44de04546
Signed-off-by: Slawomir Rosek <srosek@google.com>
Signed-off-by: Jeff Xu <jeffxu@google.com>