ieee802154: add wpan_phy dump support

This patch adds support for dumping wpan_phy attributes via nl802154.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c
index ae5ecbc..18bc7e7 100644
--- a/net/ieee802154/core.c
+++ b/net/ieee802154/core.c
@@ -27,7 +27,7 @@
 
 /* RCU-protected (and RTNL for writers) */
 LIST_HEAD(cfg802154_rdev_list);
-static int cfg802154_rdev_list_generation;
+int cfg802154_rdev_list_generation;
 
 static int wpan_phy_match(struct device *dev, const void *data)
 {