block: pass in blk_mq_tags to blk_mq_rq_ctx_init()

Instead of getting this from data for every invocation of request
initialization, pass it in as an argument instead.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20211019153300.623322-3-axboe@kernel.dk


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