wlan:11AC Tx BeamForming Feature support.

Modified the driver to support 11AC Tx Beamforming Feature.

Change-Id: I4e08692f1637261315e41372a5891854a286300c
(cherry picked from commit af6fe6b148f1979b7c821b990a12d956d3cb39a3)
diff --git a/CORE/WDI/CP/inc/wlan_qct_wdi.h b/CORE/WDI/CP/inc/wlan_qct_wdi.h
index bc17b97..6c67bad 100644
--- a/CORE/WDI/CP/inc/wlan_qct_wdi.h
+++ b/CORE/WDI/CP/inc/wlan_qct_wdi.h
@@ -1346,6 +1346,7 @@
 #ifdef WLAN_FEATURE_11AC
   wpt_uint8                 ucVhtCapableSta;
   wpt_uint8                 ucVhtTxChannelWidthSet;
+  wpt_uint8                 ucVhtTxBFEnabled;
 #endif
 
   wpt_uint8                 ucHtLdpcEnabled;