wifi: iwlwifi: bump FW API to 84 for AX/BZ/SC devices

Start supporting API version 84 for new devices.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230926110319.eae20f9fdc06.Ifa9be6482121ea6df364bddc96ea6a7d101366b6@changeid


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