selftests/seccomp: Test SECCOMP_IOCTL_NOTIF_ADDFD

Test whether we can add file descriptors in response to notifications.
This injects the file descriptors via notifications, and then uses kcmp
to determine whether or not it has been successful.

It also includes some basic sanity checking for arguments.

Signed-off-by: Sargun Dhillon <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Chris Palmer <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Robert Sesek <[email protected]>
Cc: Tycho Andersen <[email protected]>
Cc: Matt Denton <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Co-developed-by: Kees Cook <[email protected]>
Signed-off-by: Kees Cook <[email protected]>

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