net/mlx5: Implement thermal zone

Implement thermal zone support for mlx5 based HW. The NIC
uses temperature sensor provided by ASIC to report current temperature
to thermal core.

Signed-off-by: Sandipan Patra <spatra@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20230314054234.267365-5-saeed@kernel.org


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