net: add moduleparam.h for users of module_param/MODULE_PARM_DESC

These files were getting access to these two via the implicit
presence of module.h everywhere.  They aren't modules, so they
don't need the full module.h inclusion though.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 2520a1b..c23052b 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -42,6 +42,7 @@
 #include <linux/ctype.h>
 #include <linux/nl80211.h>
 #include <linux/platform_device.h>
+#include <linux/moduleparam.h>
 #include <net/cfg80211.h>
 #include "core.h"
 #include "reg.h"