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/PM854.h b/include/configs/PM854.h
index 93090b9..a6a1e73 100644
--- a/include/configs/PM854.h
+++ b/include/configs/PM854.h
@@ -282,6 +282,7 @@
 /* Options are: TSEC[0-1] */
 #define CONFIG_ETHPRIME		"TSEC0"
 
+#define CONFIG_HAS_ETH0
 #define	CONFIG_HAS_ETH1		1
 #define	CONFIG_HAS_ETH2		1