qcacld-3.0: Change default value of CSN to 4

Change default value of CSN to 4 to disable default capability of
8 stream beamformee. The value can still be configured with ini.

Change-Id: I814e10cc7da176dd12c154b8870b4d261ebb4789
CRs-Fixed: 2231358

core/mac/inc/wni_cfg.h

@@ -920,7 +920,7 @@ enum {
 
 #define WNI_CFG_VHT_CSN_BEAMFORMEE_ANT_SUPPORTED_STAMIN    0
 #define WNI_CFG_VHT_CSN_BEAMFORMEE_ANT_SUPPORTED_STAMAX    8
-#define WNI_CFG_VHT_CSN_BEAMFORMEE_ANT_SUPPORTED_STADEF    8
+#define WNI_CFG_VHT_CSN_BEAMFORMEE_ANT_SUPPORTED_STADEF    4
 /*
  * WNI_CFG_VHT_CSN_BEAMFORMEE_ANT_SUPPORTED_FW_DEF + 1 is
  * assumed to be the default fw supported BF antennas, if fw