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/at1700.c b/drivers/net/at1700.c
index 871b163..f4744fc 100644
--- a/drivers/net/at1700.c
+++ b/drivers/net/at1700.c
@@ -270,9 +270,9 @@
 
 static int __init at1700_probe1(struct net_device *dev, int ioaddr)
 {
-	char fmv_irqmap[4] = {3, 7, 10, 15};
-	char fmv_irqmap_pnp[8] = {3, 4, 5, 7, 9, 10, 11, 15};
-	char at1700_irqmap[8] = {3, 4, 5, 9, 10, 11, 14, 15};
+	static const char fmv_irqmap[4] = {3, 7, 10, 15};
+	static const char fmv_irqmap_pnp[8] = {3, 4, 5, 7, 9, 10, 11, 15};
+	static const char at1700_irqmap[8] = {3, 4, 5, 9, 10, 11, 14, 15};
 	unsigned int i, irq, is_fmv18x = 0, is_at1700 = 0;
 	int slot, ret = -ENODEV;
 	struct net_local *lp = netdev_priv(dev);