unix: add more SECCOMP constants

Update the SECCOMP regex to fetch more SECCOMP constants.

Change-Id: I192ff7cb11fc38f0b0f08d6cba0a4f8649f9775e
Reviewed-on: https://go-review.googlesource.com/c/sys/+/553776
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Matt Layher <mdlayher@gmail.com>

unix/zerrors_linux_mips.go

@@ -281,6 +281,9 @@ const (
 	SCM_TIMESTAMPNS                  = 0x23
 	SCM_TXTIME                       = 0x3d
 	SCM_WIFI_STATUS                  = 0x29
+	SECCOMP_IOCTL_NOTIF_ADDFD        = 0x80182103
+	SECCOMP_IOCTL_NOTIF_ID_VALID     = 0x80082102
+	SECCOMP_IOCTL_NOTIF_SET_FLAGS    = 0x80082104
 	SFD_CLOEXEC                      = 0x80000
 	SFD_NONBLOCK                     = 0x80
 	SIOCATMARK                       = 0x40047307