iwlwifi: mvm: don't configure mimo rates if nss is limited to 1

Remote peer can publish a different number of supported nss via the
operating mode notification IE or action frame. If it limits to 1
then we don't want mimo rates configured in the rate table.
Signed-off-by: NEyal Shapira <eyal@wizery.com>
Reviewed-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/mvm/rs.c

@@ -2250,6 +2250,9 @@ static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
 		}
 	}
 
+	if (sta->rx_nss < 2)
+		return;
+
 	highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
 	if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
 		for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {