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/MPC8349ITX.h b/include/configs/MPC8349ITX.h
index 58ee13d..c5d0362 100644
--- a/include/configs/MPC8349ITX.h
+++ b/include/configs/MPC8349ITX.h
@@ -378,6 +378,7 @@
 #define CONFIG_TSEC1
 
 #ifdef CONFIG_TSEC1
+#define CONFIG_HAS_ETH0
 #define CONFIG_TSEC1_NAME  "TSEC0"
 #define CFG_TSEC1_OFFSET	0x24000
 #define TSEC1_PHY_ADDR		0x1c	/* VSC8201 uses address 0x1c */