iwlwifi: 8000: add 11n only SKU of 8000 devices

The 8000 family includes devices that don't support 11ac.
Add an iwl_cfg structure for them.

Signed-off-by: Ariej Marjieh <ariej.marjieh@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/iwl-config.h

@@ -324,6 +324,7 @@ extern const struct iwl_cfg iwl7265_2ac_cfg;
 extern const struct iwl_cfg iwl7265_2n_cfg;
 extern const struct iwl_cfg iwl7265_n_cfg;
 extern const struct iwl_cfg iwl8260_2ac_cfg;
+extern const struct iwl_cfg iwl8260_n_cfg;
 #endif /* CONFIG_IWLMVM */
 
 #endif /* __IWL_CONFIG_H__ */