ieee820154: add lbt setting support

This patch adds support for setting listen before transmit mode via
nl802154 framework.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/ieee802154/rdev-ops.h b/net/ieee802154/rdev-ops.h
index f9171aa..a78f700 100644
--- a/net/ieee802154/rdev-ops.h
+++ b/net/ieee802154/rdev-ops.h
@@ -68,4 +68,11 @@
 						max_frame_retries);
 }
 
+static inline int
+rdev_set_lbt_mode(struct cfg802154_registered_device *rdev,
+		  struct wpan_dev *wpan_dev, const bool mode)
+{
+	return rdev->ops->set_lbt_mode(&rdev->wpan_phy, wpan_dev, mode);
+}
+
 #endif /* __CFG802154_RDEV_OPS */