wlan: Dynamic configuration of VHT support in 2.4 GHz band

Providing fix for allowing the user to select VHT support through
INI file in 2.4 GHz band.

Change-Id: Ib80159f73b57f6e62ca1077135f16a8c54f54866
CRs-Fixed: 492379
diff --git a/CORE/HDD/src/wlan_hdd_cfg80211.c b/CORE/HDD/src/wlan_hdd_cfg80211.c
index 9564479..a833c47 100644
--- a/CORE/HDD/src/wlan_hdd_cfg80211.c
+++ b/CORE/HDD/src/wlan_hdd_cfg80211.c
@@ -1932,6 +1932,13 @@
          ((WLAN_HDD_GET_CTX(pHostapdAdapter))->cfg_ini->dot11Mode == eHDD_DOT11_MODE_11ac_ONLY)) )
     {
         pConfig->SapHw_mode = eSAP_DOT11_MODE_11ac;
+
+        /* Disable VHT support in 2.4 GHz band */
+        if (pConfig->channel <= 14 &&
+            (WLAN_HDD_GET_CTX(pHostapdAdapter))->cfg_ini->enableVhtFor24GHzBand == FALSE)
+        {
+            pConfig->SapHw_mode = eSAP_DOT11_MODE_11n;
+        }
     }
 #endif