cfg80211: pass DFS region to drivers through reg_notifier()

This grants drivers access to the DFS region that a
regulatory domain belongs to.

Signed-off-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 69141ed..b66444d 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1121,6 +1121,8 @@
 	if (ignore_reg_update(wiphy, initiator))
 		return;
 
+	last_request->dfs_region = cfg80211_regdomain->dfs_region;
+
 	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 		if (wiphy->bands[band])
 			handle_band(wiphy, band, initiator);