net/mlx5e: Don't update netdev RQs with PTP-RQ

Since the driver opens the PTP-RQ under channel 0, it appears to the
stack as if the SKB was received on rxq0. So from thew stack POV there
are still the same number of RX queues.

Fixes: 960fbfe2

 ("net/mlx5e: Allow coexistence of CQE compression and HW TS PTP")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>