linux-phytec-fsl

blk-mq: remove blk_mq_alloc_rq

There's only one caller, which is a straight wrapper and fits the naming
scheme of the related functions a lot better.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>