cfg80211: move add/change interface monitor flags into params

Instead passing both flags, which can be NULL, and vif_params,
which are never NULL, move the flags into the vif_params and
use BIT(0), which is invalid from userspace, to indicate that
the flags were changed.

While updating all drivers, fix a small bug in wil6210 where
it was setting the flags to 0 instead of leaving them unchanged.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/rndis_wlan.c

@@ -479,7 +479,7 @@ struct rndis_wlan_private {
  */
 static int rndis_change_virtual_intf(struct wiphy *wiphy,
 					struct net_device *dev,
-					enum nl80211_iftype type, u32 *flags,
+					enum nl80211_iftype type,
 					struct vif_params *params);
 
 static int rndis_scan(struct wiphy *wiphy,
@@ -1857,7 +1857,7 @@ error:
  */
 static int rndis_change_virtual_intf(struct wiphy *wiphy,
 					struct net_device *dev,
-					enum nl80211_iftype type, u32 *flags,
+					enum nl80211_iftype type,
 					struct vif_params *params)
 {
 	struct rndis_wlan_private *priv = wiphy_priv(wiphy);