apparmor: Free up __cleanup() name

In order to use __cleanup for __attribute__((__cleanup__(func))) the
name must not be used for anything else. Avoid the conflict.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: John Johansen <john.johansen@canonical.com>
Link: https://lkml.kernel.org/r/20230612093537.536441207%40infradead.org