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/tftp.c b/net/tftp.c
index bafc354..8ddc7be 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -435,7 +435,7 @@
 		break;
 	}
 
-	NetSendUDPPacket(NetServerEther, tftp_remote_ip, TftpRemotePort,
+	NetSendUDPPacket(net_server_ethaddr, tftp_remote_ip, TftpRemotePort,
 			 TftpOurPort, len);
 }
 
@@ -816,7 +816,7 @@
 	TftpBlock = 0;
 
 	/* zero out server ether in case the server ip has changed */
-	memset(NetServerEther, 0, 6);
+	memset(net_server_ethaddr, 0, 6);
 	/* Revert TftpBlkSize to dflt */
 	TftpBlkSize = TFTP_BLOCK_SIZE;
 #ifdef CONFIG_MCAST_TFTP
@@ -861,7 +861,7 @@
 	net_set_udp_handler(tftp_handler);
 
 	/* zero out server ether in case the server ip has changed */
-	memset(NetServerEther, 0, 6);
+	memset(net_server_ethaddr, 0, 6);
 }
 #endif /* CONFIG_CMD_TFTPSRV */