iwlwifi: mvm: support NVM sections for family 8000

The identification of the hardware section in the NVM
of new devices has been changed, hence the need to add it
to iwl_cfg and adapt the code that uses this value
accordingly.

Signed-off-by: Eran Harary <eran.harary@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>