mac80211: make cfg80211 ops and privid const

The wiphy privid (to identify wiphys) and the cfg80211
ops should both be const, so change them to be.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/cfg.h b/net/mac80211/cfg.h
index 7d7879f..2d51f62 100644
--- a/net/mac80211/cfg.h
+++ b/net/mac80211/cfg.h
@@ -4,6 +4,6 @@
 #ifndef __CFG_H
 #define __CFG_H
 
-extern struct cfg80211_ops mac80211_config_ops;
+extern const struct cfg80211_ops mac80211_config_ops;
 
 #endif /* __CFG_H */