io_uring: lock annotate timeouts and poll

Add timeout and poll ->comletion_lock annotations for Sparse, makes life
easier while looking at the functions.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/2345325643093d41543383ba985a735aeb899eac.1617287883.git.asml.silence@gmail.com


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