net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules

These files are non modular, but need to export symbols using
the macros now living in export.h -- call out the include so
that things won't break when we remove the implicit presence
of module.h from everywhere.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/net/mac80211/rc80211_minstrel_debugfs.c b/net/mac80211/rc80211_minstrel_debugfs.c
index a290ad2..d5a5622 100644
--- a/net/mac80211/rc80211_minstrel_debugfs.c
+++ b/net/mac80211/rc80211_minstrel_debugfs.c
@@ -50,6 +50,7 @@
 #include <linux/debugfs.h>
 #include <linux/ieee80211.h>
 #include <linux/slab.h>
+#include <linux/export.h>
 #include <net/mac80211.h>
 #include "rc80211_minstrel.h"