Set spacecast MAC_ADDR to eth1.

Spacecast phy is hooked to GEMAC 1. Therefore, we should set eth1 to
MAC_ADDR. In the meantime MAC_ADDR_WAN is not used any more. Thus the
removal.

Change-Id: Ib1f454abdea1ef499f0dfb3bc45f82bfd7424e6a
diff --git a/arch/arm/boards/optimus/env_spacecast/bin/init b/arch/arm/boards/optimus/env_spacecast/bin/init
index 96bac1a..9a64e17 100644
--- a/arch/arm/boards/optimus/env_spacecast/bin/init
+++ b/arch/arm/boards/optimus/env_spacecast/bin/init
@@ -19,8 +19,7 @@
 addpart /dev/nor0 $nor_parts
 
 hnvram from /dev/nor0.hnvram
-[ $HNV_MAC_ADDR ] && eth0.ethaddr=$HNV_MAC_ADDR
-[ $HNV_MAC_ADDR_WAN ] && eth1.ethaddr=$HNV_MAC_ADDR_WAN
+[ $HNV_MAC_ADDR ] && eth1.ethaddr=$HNV_MAC_ADDR
 
 if [ x$arl  = xfailover ]; then
   echo "Failing over to other image because antirebootloop=$arl"