drivers/net/*.c: Use static const

Using static const generally increases object text and decreases data size.
It also generally decreases overall object size.

Signed-off-by: Joe Perches <joe@perches.com>
diff --git a/drivers/net/3c501.c b/drivers/net/3c501.c
index 1776ab6..9e1c03e 100644
--- a/drivers/net/3c501.c
+++ b/drivers/net/3c501.c
@@ -158,8 +158,8 @@
 struct net_device * __init el1_probe(int unit)
 {
 	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
-	static unsigned ports[] = { 0x280, 0x300, 0};
-	unsigned *port;
+	static const unsigned ports[] = { 0x280, 0x300, 0};
+	const unsigned *port;
 	int err = 0;
 
 	if (!dev)