wifi: iwlwifi: bump FW API to 75 for AX devices

Start supporting API version 75 for AX devices.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230329100040.f08a27944fc6.Iafe3a2db2b91072a559038b85eca7b6b322be3ff@changeid


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