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/sntp.c b/net/sntp.c
index 3e45a83..b99aa3e 100644
--- a/net/sntp.c
+++ b/net/sntp.c
@@ -37,7 +37,7 @@
 	SntpOurPort = 10000 + (get_timer(0) % 4096);
 	sport = NTP_SERVICE_PORT;
 
-	NetSendUDPPacket(NetServerEther, net_ntp_server, sport, SntpOurPort,
+	NetSendUDPPacket(net_server_ethaddr, net_ntp_server, sport, SntpOurPort,
 			 pktlen);
 }
 
@@ -85,7 +85,7 @@
 
 	NetSetTimeout(SNTP_TIMEOUT, SntpTimeout);
 	net_set_udp_handler(sntp_handler);
-	memset(NetServerEther, 0, sizeof(NetServerEther));
+	memset(net_server_ethaddr, 0, sizeof(net_server_ethaddr));
 
 	SntpSend();
 }