io_uring: rename io_queue_async_work()

Rename io_queue_async_work(). The name is pretty old but now doesn't
reflect well what the function is doing.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/5d4b25c54cccf084f9f2fd63bd4e4fa4515e998e.1650056133.git.asml.silence@gmail.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>