nl80211/cfg80211: add WIPHY_FLAG_AP_UAPSD flag

add WIPHY_FLAG_AP_UAPSD flag to indicate uapsd support on
AP mode.

Advertise it to userspace by including a new
NL80211_ATTR_SUPPORT_AP_UAPSD attribute.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 53609de..01c6bde 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1621,6 +1621,7 @@
  * @WIPHY_FLAG_SUPPORTS_SCHED_SCAN: The device supports scheduled scans.
  * @WIPHY_FLAG_SUPPORTS_FW_ROAM: The device supports roaming feature in the
  *	firmware.
+ * @WIPHY_FLAG_AP_UAPSD: The device supports uapsd on AP.
  */
 enum wiphy_flags {
 	WIPHY_FLAG_CUSTOM_REGULATORY		= BIT(0),
@@ -1636,6 +1637,7 @@
 	WIPHY_FLAG_SUPPORTS_SCHED_SCAN		= BIT(11),
 	WIPHY_FLAG_ENFORCE_COMBINATIONS		= BIT(12),
 	WIPHY_FLAG_SUPPORTS_FW_ROAM		= BIT(13),
+	WIPHY_FLAG_AP_UAPSD			= BIT(14),
 };
 
 /**