seccomp: add mlockall to whitelist

This is used by "-realtime mlock=on".

Signed-off-by: Eduardo Otubo <eduardo.otubo@profitbricks.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Tested-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Eduardo Otubo <eduardo.otubo@profitbricks.com>

qemu-seccomp.c

@@ -229,6 +229,7 @@ static const struct QemuSeccompSyscall seccomp_whitelist[] = {
     { SCMP_SYS(shmdt), 240 },
     { SCMP_SYS(timerfd_create), 240 },
     { SCMP_SYS(shmctl), 240 },
+    { SCMP_SYS(mlockall), 240 },
     { SCMP_SYS(mlock), 240 },
     { SCMP_SYS(munlock), 240 },
     { SCMP_SYS(semctl), 240 },