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>

include/net/mac80211.h

@@ -1245,6 +1245,7 @@ enum ieee80211_sta_rx_bandwidth {
  *	station can receive at the moment, changed by operating mode
  *	notifications and capabilities. The value is only valid after
  *	the station moves to associated state.
+ * @smps_mode: current SMPS mode (off, static or dynamic)
  */
 struct ieee80211_sta {
 	u32 supp_rates[IEEE80211_NUM_BANDS];
@@ -1257,6 +1258,7 @@ struct ieee80211_sta {
 	u8 max_sp;
 	u8 rx_nss;
 	enum ieee80211_sta_rx_bandwidth bandwidth;
+	enum ieee80211_smps_mode smps_mode;
 
 	/* must be last */
 	u8 drv_priv[0] __aligned(sizeof(void *));