bits/syscall.h: add landlock syscalls from linux v5.13

see

  linux commit a49f4f81cb48925e8d7cbd9e59068f516e984144
  arch: Wire up Landlock syscalls

  linuxcommit 17ae69aba89dbfa2139b7f8024b757ab3cc42f59
  Merge tag 'landlock_v34' of ... jmorris/linux-security

Landlock provides for unprivileged application sandboxing. The goal of
Landlock is to enable to restrict ambient rights (e.g. global filesystem
access) for a set of processes. Landlock is inspired by seccomp-bpf but
instead of filtering syscalls and their raw arguments, a Landlock rule
can restrict the use of kernel objects like file hierarchies, according
to the kernel semantic.

arch/arm/bits/syscall.h.in

@@ -396,6 +396,9 @@
 #define __NR_process_madvise	440
 #define __NR_epoll_pwait2	441
 #define __NR_mount_setattr	442
+#define __NR_landlock_create_ruleset	444
+#define __NR_landlock_add_rule	445
+#define __NR_landlock_restrict_self	446
 
 #define __ARM_NR_breakpoint	0x0f0001
 #define __ARM_NR_cacheflush	0x0f0002