mtd: esb2rom: constify pci_device_id.

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

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/maps/esb2rom.c

@@ -384,7 +384,7 @@ static void esb2rom_remove_one(struct pci_dev *pdev)
 	esb2rom_cleanup(window);
 }
 
-static struct pci_device_id esb2rom_pci_tbl[] = {
+static const struct pci_device_id esb2rom_pci_tbl[] = {
 	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0,
 	  PCI_ANY_ID, PCI_ANY_ID, },
 	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
@@ -414,7 +414,7 @@ static struct pci_driver esb2rom_driver = {
 static int __init init_esb2rom(void)
 {
 	struct pci_dev *pdev;
-	struct pci_device_id *id;
+	const struct pci_device_id *id;
 	int retVal;
 
 	pdev = NULL;