nvme-pci: remove superfluous arguments

The call chain in the prep_rq and completion paths passes around a lot
of nvme_dev, nvme_queue and nvme_command arguments that can be trivially
derived from the passed in struct request.  Remove them.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20250625113531.522027-6-hch@lst.de


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