video: fbdev: intelfb: 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.

File size before:
text data bss dec hex filename
11749 896 24 12669 317d video/fbdev/intelfb/intelfbdrv.o

File size after adding 'const':
text data bss dec hex filename
12173 472 24 12669 317d video/fbdev/intelfb/intelfbdrv.o

Signed-off-by: Arvind Yadav <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Benjamin Herrenschmidt <[e-mail]>
Cc: Antonino Daplas <[e-mail]>
Cc: Maik Broemme <[e-mail]>
Cc: Florian Tobias Schandinat <[e-mail]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[e-mail]>

drivers/video/fbdev/intelfb/intelfbdrv.c

···
 #define INTELFB_CLASS_MASK 0
 #endif
 
-static struct pci_device_id intelfb_pci_table[] = {
+static const struct pci_device_id intelfb_pci_table[] = {
 	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_830M, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_830M },
 	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_845G, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_845G },
 	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_85XGM, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_DISPLAY_VGA << 8, INTELFB_CLASS_MASK, INTEL_85XGM },