Before clearing the kcov descriptor associated with a thread make sure

no other thread is currently within a remote section. Otherwise, the
remote subsystem could end up in a broken state where it doesn't reset
the necessary bits upon leaving the remote section.

Therefore introduce the kr_barrier() routine which waits until all
ongoing remote sections have been left. Also, extend the scope of the
mutex to also cover fields of struct kcov_dev. This is necessary to
ensure correctness.

Reported-by: syzbot+64122a5f01be1b1abb96@syzkaller.appspotmail.com

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