mac80211: kill IEEE80211_CONF_SHORT_SLOT_TIME

No drivers use it any more, so it can now be removed safely.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index a38a82c..daa539a 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -520,12 +520,6 @@
 	IEEE80211_CONF_PS		= (1<<1),
 };
 
-/* XXX: remove all this once drivers stop trying to use it */
-static inline int __deprecated __IEEE80211_CONF_SHORT_SLOT_TIME(void)
-{
-	return 0;
-}
-#define IEEE80211_CONF_SHORT_SLOT_TIME (__IEEE80211_CONF_SHORT_SLOT_TIME())
 
 /**
  * enum ieee80211_conf_changed - denotes which configuration changed