RDMA/mlx5: Remove DEBUG ODP code

Delete DEBUG ODP dead code which is leftover from development
stage and doesn't need to be part of the upstream kernel.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Link: https://lore.kernel.org/r/20190731115627.5433-1-leon@kernel.org


Signed-off-by: Doug Ledford <dledford@redhat.com>