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/birdland/bav335x/board.c b/board/birdland/bav335x/board.c
index d1e1c8c..32ff7a4 100644
--- a/board/birdland/bav335x/board.c
+++ b/board/birdland/bav335x/board.c
@@ -384,7 +384,7 @@
 	ecode = read_eeprom(&header);
 	/* if we have a valid EE, get mac address from there */
 	if ((ecode == 0) &&
-	    is_valid_ether_addr((const u8 *)&header.mac_addr[0][0])) {
+	    is_valid_ethaddr((const u8 *)&header.mac_addr[0][0])) {
 		memcpy(mac_addr, (const void *)&header.mac_addr[0][0], 6);
 	}
 
@@ -395,7 +395,7 @@
 	if (!getenv("ethaddr")) {
 		printf("<ethaddr> not set. Validating first E-fuse MAC\n");
 
-		if (is_valid_ether_addr(mac_addr))
+		if (is_valid_ethaddr(mac_addr))
 			eth_setenv_enetaddr("ethaddr", mac_addr);
 	}