iwlwifi: update firmware for 7260 / 3160 devices

Add new firmware for devices: 7260 and 3160
version:
22.15.8.0

Supported by kernel 3.13 and up.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

WHENCE

@@ -809,9 +809,15 @@ Version: 18.168.6.1
 File: iwlwifi-7260-7.ucode
 Version: 22.1.7.0
 
+File: iwlwifi-7260-8.ucode
+Version: 22.15.8.0
+
 File: iwlwifi-3160-7.ucode
 Version: 22.1.7.0
 
+File: iwlwifi-3160-8.ucode
+Version: 22.15.8.0
+
 Licence: Redistributable. See LICENCE.iwlwifi_firmware for details
 
 Also available from http://intellinuxwireless.org/?n=Downloads