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/arch/arm/mach-davinci/misc.c b/arch/arm/mach-davinci/misc.c
index e18bdfc..e699d61 100644
--- a/arch/arm/mach-davinci/misc.c
+++ b/arch/arm/mach-davinci/misc.c
@@ -49,7 +49,7 @@
 		goto i2cerr;
 
 	/* Check that MAC address is valid. */
-	if (!is_valid_ether_addr(buf))
+	if (!is_valid_ethaddr(buf))
 		goto err;
 
 	return 1; /* Found */