Add CONFIG_HAS_ETH0 to all boards with TSEC

The 85xx code now relies on CONFIG_HAS_ETH0 to determine whether
to update TSEC1's device-tree node, so we need to add it
to all the boards with TSECs.  Do this for 83xx and 86xx, too,
since they will eventually do something similar.

Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/include/configs/MPC8313ERDB.h b/include/configs/MPC8313ERDB.h
index f92dce5..3775037 100644
--- a/include/configs/MPC8313ERDB.h
+++ b/include/configs/MPC8313ERDB.h
@@ -509,6 +509,7 @@
 
 #define CONFIG_ETHADDR		00:E0:0C:00:95:01
 #define CONFIG_HAS_ETH1
+#define CONFIG_HAS_ETH0
 #define CONFIG_ETH1ADDR		00:E0:0C:00:95:02
 
 #define CONFIG_IPADDR		10.0.0.2