net/mlx5: HWS, no need to expose mlx5hws_send_queues_open/close

No need to have mlx5hws_send_queues_open/close in header.
Make them static and remove from header.

Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Itamar Gozlan <igozlan@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20241219175841.1094544-7-tariqt@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>