wlan: SAPHT40 2.4GHz:Add OBSS Scan functionality for SAP/P2PGO

Initiate OBSS scan before starting SAP or P2PGO in HT40
mode in case 2.4GHz band.

Change-Id: I3e480249f3f3d74e691850870ea0d5320013412a
CRs-Fixed: 755512
diff --git a/CORE/MAC/src/pe/lim/limSerDesUtils.c b/CORE/MAC/src/pe/lim/limSerDesUtils.c
index 2784ebc..ae24ad1 100644
--- a/CORE/MAC/src/pe/lim/limSerDesUtils.c
+++ b/CORE/MAC/src/pe/lim/limSerDesUtils.c
@@ -739,6 +739,11 @@
         len  -= pStartBssReq->extendedRateSet.numRates;
     }
 
+#ifdef WLAN_FEATURE_AP_HT40_24G
+    /* extract apHT40_24GEnabled */
+    pStartBssReq->apHT40_24GEnabled = *pBuf++;
+    len--;
+#endif
     if (len)
     {
         limLog(pMac, LOGW, FL("Extra bytes left in SME_START_BSS_REQ, len=%d"), len);