io_uring: move SQPOLL thread io-wq forked worker
Don't use a kthread for SQPOLL, use a forked worker just like the io-wq
workers. With that done, we can drop the various context grabbing we do
for SQPOLL, it already has everything it needs.
Signed-off-by: NJens Axboe <axboe@kernel.dk>
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