RDMA/bnxt_re: Remove unnecessary sched count

Since the lifetime of bnxt_re_task is controlled by the kref of device,
sched_count is no longer required.  Remove it.

Link: https://lore.kernel.org/r/1584117207-2664-4-git-send-email-selvin.xavier@broadcom.com


Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>