RDMA/mlx5: Consolidate data direct state into one object

There are three per device data direct objects: mlx5_data_direct_dev,
mlx5_data_direct_resources and mlx5_data_direct_registration with
separate allocations. This patch consolidates all of them into the
registration object.

For this, a few things needed to happen:

- mlx5_ib_dev keeps a pointer to mlx5_data_direct.
- mlx5_data_direct_dev is now accessible from mlx5_data_direct.
  mlx5_data_direct_get_dev() is added as a helper to access
  the device pointer.
- Since mlx5_data_direct is part of mlx5_data_direct_registration,
  getting to the registration is a simple container_of. No need
  for searching the list.

Since mlx5_data_direct_resources no longer has an accurate name,
this patch renames it.

This is a preparation for the upcoming move of data_direct to
mlx5_core.

This patch has no functional changes.

Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260930114227.139274-9-tariqt@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

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