wlan: HDD: Extended Scan Implementation.

HDD changes to support Extended Scan feature
requirements.

Change-Id: I37d2603a4aa54f3e33382e81c96ba0f8dc6a3d47
CRs-Fixed: 677858
diff --git a/CORE/HDD/src/wlan_hdd_main.c b/CORE/HDD/src/wlan_hdd_main.c
index 6730b75..b544004 100644
--- a/CORE/HDD/src/wlan_hdd_main.c
+++ b/CORE/HDD/src/wlan_hdd_main.c
@@ -9021,6 +9021,11 @@
                      hdd_tx_rx_pkt_cnt_stat_timer_handler,
                      (void *)pHddCtx);
    }
+#ifdef WLAN_FEATURE_EXTSCAN
+    sme_EXTScanRegisterCallback(pHddCtx->hHal,
+            wlan_hdd_cfg80211_extscan_callback,
+                           pHddCtx);
+#endif /* WLAN_FEATURE_EXTSCAN */
    goto success;
 
 err_nl_srv: