io_uring: don't flush CQEs deep down the stack

io_submit_flush_completions() is called down the stack in the _state
version of io_req_complete(), that's ok because is only called by
io_uring opcode handler functions directly. Move it up to
__io_queue_sqe() as preparation.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>