io_uring: static_key for !IORING_SETUP_NO_SQARRAY

IORING_SETUP_NO_SQARRAY should be preferred and used by default by
liburing, optimise flag checking in io_get_sqe() with a static key.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c164a48542fbb080115e2377ecf160c758562742.1729264988.git.asml.silence@gmail.com


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