net: write enetaddr down to hardware on env_callback

If mac-address is changed using "setenv ethaddr ...." command the new
mac-adress also must be written into the responsible ethernet driver.

Signed-off-by: Hannes Schmelzer <oe5hpm@oevsv.at>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/net/eth-uclass.c b/net/eth-uclass.c
index c15cc4d..a32961e 100644
--- a/net/eth-uclass.c
+++ b/net/eth-uclass.c
@@ -227,6 +227,7 @@
 		case env_op_create:
 		case env_op_overwrite:
 			eth_parse_enetaddr(value, pdata->enetaddr);
+			eth_write_hwaddr(dev);
 			break;
 		case env_op_delete:
 			memset(pdata->enetaddr, 0, 6);