apparmor: make it so work buffers can be allocated from atomic context

In some situations AppArmor needs to be able to use its work buffers
from atomic context. Add the ability to specify when in atomic context
and hold a set of work buffers in reserve for atomic context to
reduce the chance that a large work buffer allocation will need to
be done.

Fixes: df323337e507 ("apparmor: Use a memory pool instead per-CPU caches")
Signed-off-by: John Johansen <[email protected]>

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