wifi: iwlwifi: remove support for *nJ devices

These are test chips that will never reach anyone
outside of Intel, so remove support for them.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230621130443.d9f4e0356ae4.If9eccc22eb500dfff8973a70a649d94af7a60841@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>