cc2520: fix zero perm_extended_addr address

It will remove the bug of havine zero perm_extended_addr address.

Signed-off-by: Varka Bhadram <varkab@cdac.in>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/net/ieee802154/cc2520.c b/drivers/net/ieee802154/cc2520.c
index 64017f1..a43c8ac 100644
--- a/drivers/net/ieee802154/cc2520.c
+++ b/drivers/net/ieee802154/cc2520.c
@@ -650,6 +650,7 @@
 	priv->hw->parent = &priv->spi->dev;
 	priv->hw->extra_tx_headroom = 0;
 	priv->hw->vif_data_size = sizeof(*priv);
+	ieee802154_random_extended_addr(&priv->hw->phy->perm_extended_addr);
 
 	/* We do support only 2.4 Ghz */
 	priv->hw->phy->channels_supported[0] = 0x7FFF800;