mac80211: standardize adding supported rates IEs

Relocate the mesh implementation of adding the (extended) supported
rates IE to util.c, anticipating its use by other parts of mac80211.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Cc: Kalyan C Gaddam <chakkal@iit.edu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 1e83afa..b5f7ada 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -3444,4 +3444,9 @@
 				   int rssi_max_thold);
 
 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif);
+
+int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb);
+
+int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif,
+				struct sk_buff *skb);
 #endif /* MAC80211_H */