RDMA/mlx5: Add plane index support when querying PTYS registers

Support the new "plane_ind" field when querying port PTYS registers.
This is needed when querying the rate of a plane port.

Signed-off-by: Mark Zhang <markzhang@nvidia.com>
Link: https://lore.kernel.org/r/1f703c36306aa46917fcd88eadbb23b3e380d526.1718553901.git.leon@kernel.org


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