RDMA/mlx5: Support per-plane port IB counters by querying PPCNT register

Supports per-plane port counters by querying PPCNT register with the
"extended port counters" group, as the query_vport_counter command
doesn't support plane ports.

Signed-off-by: Mark Zhang <markzhang@nvidia.com>
Link: https://lore.kernel.org/r/06ffb582d67159b7def4654c8272d3d6e8bd2f2f.1718553901.git.leon@kernel.org


Signed-off-by: Leon Romanovsky <leonro@nvidia.com>