Fix typo in CONFIG_USBNET_DEVADDR

Fix typo that was caused by the same feature being split in to 2 different
configuration options. Replace CONFIG_USBNET_DEVADDR with
CONFIG_USBNET_DEV_ADDR

Signed-off-by: Ignacio Zamora <nachopitt@gmail.com>
diff --git a/drivers/usb/gadget/ether.c b/drivers/usb/gadget/ether.c
index abb5332..6ce389d 100644
--- a/drivers/usb/gadget/ether.c
+++ b/drivers/usb/gadget/ether.c
@@ -2620,7 +2620,7 @@
 	priv->netdev = dev;
 	l_priv = priv;
 
-	get_ether_addr(CONFIG_USBNET_DEVADDR, pdata->enetaddr);
+	get_ether_addr(CONFIG_USBNET_DEV_ADDR, pdata->enetaddr);
 	eth_env_set_enetaddr("usbnet_devaddr", pdata->enetaddr);
 
 	return 0;