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/3c503.c b/drivers/net/3c503.c
index 4777a1c..d84f6e8 100644
--- a/drivers/net/3c503.c
+++ b/drivers/net/3c503.c
@@ -392,8 +392,8 @@
     int retval;
 
     if (dev->irq < 2) {
-	int irqlist[] = {5, 9, 3, 4, 0};
-	int *irqp = irqlist;
+	static const int irqlist[] = {5, 9, 3, 4, 0};
+	const int *irqp = irqlist;
 
 	outb(EGACFR_NORM, E33G_GACFR);	/* Enable RAM and interrupts. */
 	do {