iwlwifi: bump FW API to 63 for AX devices

Start supporting API version 63 for AX devices.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210411132130.a588a9dacd98.Ie4f96b8988c2cbd5f096ee64d0eb0f4829d55aee@changeid


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