net: defxx: constify eisa_device_id

eisa_device_id are not supposed to change at runtime. All functions
working with eisa_device_id provided by <linux/eisa.h> work with
const eisa_device_id. So mark the non-const structs as const.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Reviewed-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/fddi/defxx.c

@@ -3767,7 +3767,7 @@ static void dfx_pci_unregister(struct pci_dev *pdev)
 #endif /* CONFIG_PCI */
 
 #ifdef CONFIG_EISA
-static struct eisa_device_id dfx_eisa_table[] = {
+static const struct eisa_device_id dfx_eisa_table[] = {
         { "DEC3001", DEFEA_PROD_ID_1 },
         { "DEC3002", DEFEA_PROD_ID_2 },
         { "DEC3003", DEFEA_PROD_ID_3 },