net: use random ethernet address if invalid and not zero

Use random ethernet address if the ethernet address found
is invalid, not zero and config for random address
is defined.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

net/eth-uclass.c

@@ -512,7 +512,8 @@ static int eth_post_probe(struct udevice *dev)
 		eth_setenv_enetaddr_by_index("eth", dev->seq, pdata->enetaddr);
 		printf("\nWarning: %s using MAC address from ROM\n",
 		       dev->name);
-	} else if (is_zero_ethaddr(pdata->enetaddr)) {
+	} else if (is_zero_ethaddr(pdata->enetaddr) ||
+		   !is_valid_ethaddr(pdata->enetaddr)) {
 #ifdef CONFIG_NET_RANDOM_ETHADDR
 		net_random_ethaddr(pdata->enetaddr);
 		printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",