RDMA/mlx5: Take qp type from mlx5_ib_qp

Change all the places in the mlx5_ib driver to take the qp type from the
mlx5_ib_qp struct, except the QP initialization flow. It will ensure that
we check the right QP type also for vendor specific QPs.

Link: https://lore.kernel.org/r/b2e16cd65b59cd24fa81c01c7989248da44e58ea.1621413899.git.leonro@nvidia.com


Signed-off-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>