mac80211: add debugfs interface for U-APSD queue configuration

Because it's not yet decided how to configure which queues are U-APSD
enabled, add a debugfs interface for testing purposes.

Signed-off-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 39c27d8..2746391 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -581,7 +581,7 @@
 		return;
 
 	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
-		uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
+		uapsd_queues = local->uapsd_queues;
 
 	count = wmm_param[6] & 0x0f;
 	if (count == ifmgd->wmm_last_param_set)