io_uring: move io_run_local_work_locked

io_run_local_work_locked() is only used in io_uring.c, move it there.
With that we can also make __io_run_local_work() static.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/91757bcb33e5774e49fed6f2b6e058630608119b.1673274244.git.asml.silence@gmail.com


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