mac80211/cfg80211: HT capabilities for NEW_STA

Allow userspace (e.g., hostapd) to set HT capabilities for associated
STAs. This is based on a patch from Zhu Yi <yi.zhu@intel.com> (only
the NL80211_ATTR_HT_CAPABILITY for NEW_STA part is included here).

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 7afef14..0a72d1e 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -152,6 +152,7 @@
 	u16 aid;
 	u8 supported_rates_len;
 	u8 plink_action;
+	struct ieee80211_ht_cap *ht_capa;
 };
 
 /**