wifi: iwlwifi: remove NVM C step override

This was used for debug/bringup of 8000 devices, to be able to
unify between all 8000 devices with NVM override. However, this
is really no longer used, those are ancient devices by now, so
we can remove the logic.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://patch.msgid.link/20250505215513.6210ac6cda09.I83cc3e68f0ed99a922d435c203fef840a28eb0de@changeid


Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>