iwlwifi: bump FW API to 70 for AX devices

Start supporting API version 70 for AX devices.

Signed-off-by: Golan Ben Ami <golan.ben.ami@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20220205112029.a861ff3e5541.I77447cab0e944ec9e9e72e25bfd9cd59b9111f73@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>