iwlagn: Add support for bluetooth statistics notification

WiFi/BT combo devices has different statistics notification
structure, adding the support here to make sure the structure
align correctly.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index dff1b17..297f8d1 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -1322,10 +1322,14 @@
 			u32 inst_evtlog_ptr, inst_evtlog_size, inst_errlog_ptr;
 
 			struct iwl_notif_statistics statistics;
+			struct iwl_bt_notif_statistics statistics_bt;
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 			struct iwl_notif_statistics accum_statistics;
 			struct iwl_notif_statistics delta_statistics;
 			struct iwl_notif_statistics max_delta;
+			struct iwl_bt_notif_statistics accum_statistics_bt;
+			struct iwl_bt_notif_statistics delta_statistics_bt;
+			struct iwl_bt_notif_statistics max_delta_bt;
 #endif
 		} _agn;
 #endif