RDMA/qedr: Remove the query_pkey callback

Now that the query_pkey() isn't mandatory by the RDMA core for iwarp
providers, this callback can be removed from the common ops and moved to
the RoCE only ops within the qedr driver.

Link: https://lore.kernel.org/r/20200714183414.61069-8-kamalheib1@gmail.com


Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
Acked-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>