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/drivers/usb/eth/smsc95xx.c b/drivers/usb/eth/smsc95xx.c
index 6bca34d..78b469f 100644
--- a/drivers/usb/eth/smsc95xx.c
+++ b/drivers/usb/eth/smsc95xx.c
@@ -355,7 +355,7 @@
 	/* try reading mac address from EEPROM */
 	if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
 			eth->enetaddr) == 0) {
-		if (is_valid_ether_addr(eth->enetaddr)) {
+		if (is_valid_ethaddr(eth->enetaddr)) {
 			/* eeprom values are valid so use them */
 			debug("MAC address read from EEPROM\n");
 			return 0;