mac80211: stop modifying HT SMPS capability

Instead of modifying the HT SMPS capability field
for stations, track the SMPS mode explicitly in a
new field in the station struct and use it in the
drivers that care about it. This simplifies the
code using it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/net/wireless/iwlegacy/4965-rs.c b/drivers/net/wireless/iwlegacy/4965-rs.c
index f3b8e91..e8324b5 100644
--- a/drivers/net/wireless/iwlegacy/4965-rs.c
+++ b/drivers/net/wireless/iwlegacy/4965-rs.c
@@ -1183,8 +1183,7 @@
 	if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
 		return -1;
 
-	if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2) ==
-	    WLAN_HT_CAP_SM_PS_STATIC)
+	if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 		return -1;
 
 	/* Need both Tx chains/antennas to support MIMO */