iwlwifi: change beamformee STS cap

All beamformee supporting chips have the ability to support
VHT NDP in up to 4 STSs. So change the published beamformee
STS cap accordingly to 3 as it should be Nsts-1.
Signed-off-by: Eyal Shapira <eyalx.shapira@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/iwl-nvm-parse.c

@@ -264,14 +264,13 @@ static void iwl_init_vht_hw_capab(const struct iwl_cfg *cfg,
 				  struct ieee80211_sta_vht_cap *vht_cap)
 {
 	int num_ants = num_of_ant(data->valid_rx_ant);
-	int bf_sts_cap = num_ants - 1;
 
 	vht_cap->vht_supported = true;
 
 	vht_cap->cap = IEEE80211_VHT_CAP_SHORT_GI_80 |
 		       IEEE80211_VHT_CAP_RXSTBC_1 |
 		       IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
-		       bf_sts_cap << IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT |
+		       3 << IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT |
 		       7 << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
 
 	if (num_ants > 1)