iwlwifi: update -22 firmware for 3168

This device was forgotten in the update.

Revision number: 391740
Build number: WFFW33799_R19

Change-Id: I800661d000e820ff5af1c938ae4f33e855c4ed1c
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

WHENCE

@@ -933,7 +933,7 @@ File: iwlwifi-3168-21.ucode
 Version 21.302800.0
 
 File: iwlwifi-3168-22.ucode
-Version 22.361476.0
+Version 22.391740.0
 
 File: iwlwifi-3168-27.ucode
 Version 27.455470.0