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/board/bct-brettl2/bct-brettl2.c b/board/bct-brettl2/bct-brettl2.c
index 6be9b18..1f0dfb4 100644
--- a/board/bct-brettl2/bct-brettl2.c
+++ b/board/bct-brettl2/bct-brettl2.c
@@ -32,7 +32,7 @@
 static void board_init_enetaddr(uchar *mac_addr)
 {
 	puts("Warning: Generating 'random' MAC address\n");
-	eth_random_addr(mac_addr);
+	net_random_ethaddr(mac_addr);
 	eth_setenv_enetaddr("ethaddr", mac_addr);
 }