configs: mx51evk: Remove CONFIG_HAS_ETH1

mx51evk has only one Ethernet port, so remove CONFIG_HAS_ETH1 option.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/include/configs/mx51evk.h b/include/configs/mx51evk.h
index 34b0783..d3edcba 100644
--- a/include/configs/mx51evk.h
+++ b/include/configs/mx51evk.h
@@ -96,7 +96,6 @@
 /*
  * Eth Configs
  */
-#define CONFIG_HAS_ETH1
 #define CONFIG_MII
 
 #define CONFIG_FEC_MXC