ioctl support to get stats in SAP mode

"iwpriv wlan0 get_stats" support is added in SAP to get txrx stats.

Change-Id: Iae2acf473b16470c762c46bde12ba83a876b2118
CRs-Fixed: 730867
diff --git a/CORE/HDD/inc/wlan_hdd_wext.h b/CORE/HDD/inc/wlan_hdd_wext.h
index f4b73f7..ba402fb 100644
--- a/CORE/HDD/inc/wlan_hdd_wext.h
+++ b/CORE/HDD/inc/wlan_hdd_wext.h
@@ -335,6 +335,9 @@
 extern void hdd_wlan_get_version(hdd_adapter_t *pAdapter,
                                  union iwreq_data *wrqu, char *extra);
 
+extern void hdd_wlan_get_stats(hdd_adapter_t *pAdapter, v_U16_t *length,
+                               char *buffer, v_U16_t buf_len);
+
 extern int iw_get_scan(struct net_device *dev,
                        struct iw_request_info *info,
                        union iwreq_data *wrqu, char *extra);