MIPS: add seccomp syscall

Wires up the new seccomp syscall.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index 3245474..ab02d14 100644
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -578,3 +578,4 @@
 	PTR	sys_sched_setattr
 	PTR	sys_sched_getattr		/* 4350 */
 	PTR	sys_renameat2
+	PTR	sys_seccomp