net/mlx5: allocate DMA pool structs on the pool's NUMA node

The mlx5 DMA pool structs (mlx5_dma_pool, mlx5_dma_pool_page and its
block bitmap, and mlx5_frag_buf_node_pools) are allocated without a
node hint, so they land on the node of whichever CPU happens to create
or fill the pool, while the DMA pages they describe are allocated on
the pool's node.

The pool, page and bitmap are dereferenced on every block allocation
and free. Allocate them on the pool's NUMA node as well, so that all
of a pool's state lives on one node.

These allocations happen on the control path, so the performance gain
is expected to be small; the change is mainly for consistency.

Signed-off-by: Seongjun Hong <hsj0512@snu.ac.kr>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20261006-net-mlx5-numa-allocate-pool-page-v2-1-0dc4c2eb1376@snu.ac.kr
Signed-off-by: Paolo Abeni <pabeni@redhat.com>