[apparmor] Pesky '=' in subj= of audit in mainline

[Casey Schaufler]

The Ubuntu kernel has "subj=unconfined" in its audit records.
The Linus v5.16-rc4 kernel has "subj==unconfined".

I see in the upstream where the extra "=" comes from, but I
don't see how to get to that code. I have not looked into the
patches Ubuntu is using, but there must be something.