nvme-fc: remove ->poll implementation

It's specifically looking for a given request, which we will not be
supporting going forward. Also kill the qla2xxx poll implementation
as that's the only user of the nvme-fc poll, and the now unused
->poll_queue() hook.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by:  James Smart <jsmart2021@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

include/linux/nvme-fc-driver.h

@@ -403,7 +403,6 @@ struct nvme_fc_port_template {
 				void **handle);
 	void	(*delete_queue)(struct nvme_fc_local_port *,
 				unsigned int qidx, void *handle);
-	void	(*poll_queue)(struct nvme_fc_local_port *, void *handle);
 	int	(*ls_req)(struct nvme_fc_local_port *,
 				struct nvme_fc_remote_port *,
 				struct nvmefc_ls_req *);