iwlwifi: bump FW API to 69 for AX devices

Start supporting API version 69 for AX devices.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211219121514.7d8fe0dffaea.I2de65c1efd9ab464d4158a3d852f73efe63024f8@changeid


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