landlock: Remove useless include

Remove useless audit.h include.

Cc: Günther Noack <gnoack@google.com>
Fixes: 33e65b0d3a ("landlock: Add AUDIT_LANDLOCK_ACCESS and log ptrace denials")
Link: https://lore.kernel.org/r/20251219193855.825889-1-mic@digikod.net
Reviewed-by: Günther Noack <gnoack3000@gmail.com>
Signed-off-by: Mickaël Salaün <mic@digikod.net>

security/landlock/ruleset.c

@@ -23,7 +23,6 @@
 #include <linux/workqueue.h>
 
 #include "access.h"
-#include "audit.h"
 #include "domain.h"
 #include "limits.h"
 #include "object.h"