net: cosmetic: Name ethaddr variables consistently

Use "_ethaddr" at the end of variables and drop CamelCase.
Make constant values actually 'const'.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/net/nfs.c b/net/nfs.c
index 1e5c1c3..23a9cc3 100644
--- a/net/nfs.c
+++ b/net/nfs.c
@@ -211,7 +211,7 @@
 	else
 		sport = NfsSrvNfsPort;
 
-	NetSendUDPPacket(NetServerEther, nfs_server_ip, sport, NfsOurPort,
+	NetSendUDPPacket(net_server_ethaddr, nfs_server_ip, sport, NfsOurPort,
 			 pktlen);
 }
 
@@ -788,7 +788,7 @@
 	NfsOurPort = 1000;
 
 	/* zero out server ether in case the server ip has changed */
-	memset(NetServerEther, 0, 6);
+	memset(net_server_ethaddr, 0, 6);
 
 	NfsSend();
 }