platform: mellanox: mlx-platform: Add reset callback

On L1 switches reset should include special actions against CPLD device
for performing graceful operations.
For that purpose, special PLATFORM_RESET# signal should be indicated.

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Reviewed-by: Michael Shych <michaelsh@nvidia.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230822113451.13785-10-vadimp@nvidia.com


Signed-off-by: Hans de Goede <hdegoede@redhat.com>