iwlwifi: bump FW API to 68 for AX devices

Start supporting API version 68 for AX devices.
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211204174545.695e3db16cf5.Ie94a3ad1c7a300cff7ecde26a732779159ec919e@changeidSigned-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/cfg/22000.c

@@ -9,7 +9,7 @@
 #include "iwl-prph.h"
 
 /* Highest firmware API version supported */
-#define IWL_22000_UCODE_API_MAX	67
+#define IWL_22000_UCODE_API_MAX	68
 
 /* Lowest firmware API version supported */
 #define IWL_22000_UCODE_API_MIN	39