RDMA/mlx5: Remove iova from struct mlx5_core_mkey

[ Upstream commit cf6a8b1b ]

iova is already stored in ibmr->iova, no need to store it here.

Signed-off-by: Aharon Landau <aharonl@nvidia.com>
Reviewed-by: Shay Drory <shayd@nvidia.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Stable-dep-of: 235f2384 ("RDMA/mlx5: Fix indirect mkey ODP page count")
Signed-off-by: Sasha Levin <sashal@kernel.org>