nl80211: Add set/get for frag/rts threshold and retry limits

Add new nl80211 attributes that can be used with NL80211_CMD_SET_WIPHY
and NL80211_CMD_GET_WIPHY to manage fragmentation/RTS threshold and
retry limits.

Since these values are stored in struct wiphy, remove the local copy
from mac80211 where feasible (frag & rts threshold). The retry limits
are currently needed in struct ieee80211_conf, but these could be
eventually removed since the driver should have access to the values
in struct wiphy.

Signed-off-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 3dd490fa..1124421 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1044,7 +1044,7 @@
 
 	/* setup RTS threshold */
 	if (local->ops->set_rts_threshold)
-		local->ops->set_rts_threshold(hw, local->rts_threshold);
+		local->ops->set_rts_threshold(hw, hw->wiphy->rts_threshold);
 
 	/* reconfigure hardware */
 	ieee80211_hw_config(local, ~0);