iwlwifi: add new PCI IDs for 6000g2 devices

Add new PCI IDs for 6000 Series Gen2 devices
and also defines a new sku of device: 6000g2b 2x2 bgn.

Signed-off-by: Shanyu Zhao <shanyu.zhao@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.h b/drivers/net/wireless/iwlwifi/iwl-agn.h
index f7ef893..5c32777 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.h
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.h
@@ -81,6 +81,7 @@
 extern struct iwl_cfg iwl6000g2b_bg_cfg;
 extern struct iwl_cfg iwl6000g2b_2agn_cfg;
 extern struct iwl_cfg iwl6000g2b_2abg_cfg;
+extern struct iwl_cfg iwl6000g2b_2bgn_cfg;
 extern struct iwl_cfg iwl6000g2b_2bg_cfg;
 extern struct iwl_cfg iwl6000i_2agn_cfg;
 extern struct iwl_cfg iwl6000i_2abg_cfg;