nl80211: allow configuring IBSS beacon interval

Make the JOIN_IBSS command look at the beacon interval
attribute to see if the user requested a specific beacon
interval, if not default to 100 TU (wext too).

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 54bc69c..7f7b53b 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -733,6 +733,7 @@
  *	IBSSs to join on other channels.
  * @ie: information element(s) to include in the beacon
  * @ie_len: length of that
+ * @beacon_interval: beacon interval to use
  */
 struct cfg80211_ibss_params {
 	u8 *ssid;
@@ -740,6 +741,7 @@
 	struct ieee80211_channel *channel;
 	u8 *ie;
 	u8 ssid_len, ie_len;
+	u16 beacon_interval;
 	bool channel_fixed;
 };