[media] tw68: make tw68_pci_tbl static and constify

drivers/media/pci/tw68/tw68-core.c:72:22: warning: symbol 'tw68_pci_tbl' was not declared. Should it be static?
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/pci/tw68/tw68-core.c

@@ -69,7 +69,7 @@ static atomic_t tw68_instance = ATOMIC_INIT(0);
  * the PCI ID database up to date.  Note that the entries must be
  * added under vendor 0x1797 (Techwell Inc.) as subsystem IDs.
  */
-struct pci_device_id tw68_pci_tbl[] = {
+static const struct pci_device_id tw68_pci_tbl[] = {
 	{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_6800)},
 	{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_6801)},
 	{PCI_DEVICE(PCI_VENDOR_ID_TECHWELL, PCI_DEVICE_ID_6804)},