cfg80211: add VHT support for IBSS

Add NL80211_EXT_FEATURE_VHT_IBSS flag and VHT
support for IBSS.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 2dcf9bb..8ee31f1 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -4328,11 +4328,13 @@
 
 /**
  * enum nl80211_ext_feature_index - bit index of extended features.
+ * @NL80211_EXT_FEATURE_VHT_IBSS: This driver supports IBSS with VHT datarates.
  *
  * @NUM_NL80211_EXT_FEATURES: number of extended features.
  * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
  */
 enum nl80211_ext_feature_index {
+	NL80211_EXT_FEATURE_VHT_IBSS,
 
 	/* add new features before the definition below */
 	NUM_NL80211_EXT_FEATURES,