cfg80211: remove WDS code

Remove all the code that was there to configure WDS interfaces,
now that there's no way to reach it anymore.

Link: https://lore.kernel.org/r/20201109105103.8f5b98e4068d.I5f5129041649ef2862b69683574bb3344743727b@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/cfg80211.h

@@ -3745,8 +3745,6 @@ struct mgmt_frame_regs {
  * @get_tx_power: store the current TX power into the dbm variable;
  *	return 0 if successful
  *
- * @set_wds_peer: set the WDS peer for a WDS interface
- *
  * @rfkill_poll: polls the hw rfkill line, use cfg80211 reporting
  *	functions to adjust rfkill hw state
  *
@@ -4067,9 +4065,6 @@ struct cfg80211_ops {
 	int	(*get_tx_power)(struct wiphy *wiphy, struct wireless_dev *wdev,
 				int *dbm);
 
-	int	(*set_wds_peer)(struct wiphy *wiphy, struct net_device *dev,
-				const u8 *addr);
-
 	void	(*rfkill_poll)(struct wiphy *wiphy);
 
 #ifdef CONFIG_NL80211_TESTMODE