rust: block: do not use removed queue limit API

The Rust block layer API was using the old queue limit API, which was just
removed. Use the new API instead.

Reported-by: Boqun Feng <boqun.feng@gmail.com>
Fixes: 3253aba3 ("rust: block: introduce `kernel::block::mq` module")
Signed-off-by: Andreas Hindborg <a.hindborg@samsung.com>
Link: https://lore.kernel.org/r/20240614235350.621121-1-nmi@metaspace.dk


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