mac80211: configure BSS_CHANGED_ARP_FILTER on reconfiguration

Configure arp filtering on sta reconfiguration.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index ac7ea29..eb1a5f7 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1234,7 +1234,8 @@
 
 		switch (sdata->vif.type) {
 		case NL80211_IFTYPE_STATION:
-			changed |= BSS_CHANGED_ASSOC;
+			changed |= BSS_CHANGED_ASSOC |
+				   BSS_CHANGED_ARP_FILTER;
 			mutex_lock(&sdata->u.mgd.mtx);
 			ieee80211_bss_info_change_notify(sdata, changed);
 			mutex_unlock(&sdata->u.mgd.mtx);