block: convert wbt_wait() to use rq_qos_wait()
Now that we have rq_qos_wait() in place, convert wbt_wait() over to using it with it's specific callbacks. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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