video: fbdev: i810: 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
  13132	    520	     56	  13708	   358c	video/fbdev/i810/i810_main.o

File size after adding 'const':
   text	   data	    bss	    dec	    hex	filename
  13356	    296	     56	  13708	   358c	video/fbdev/i810/i810_main.o
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Maik Broemme <mbroemme@libmpq.org>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

drivers/video/fbdev/i810/i810_main.c

@@ -107,7 +107,7 @@ static const char * const i810_pci_list[] = {
 	"Intel(R) 815 (Internal Graphics with AGP) Framebuffer Device"
 };
 
-static struct pci_device_id i810fb_pci_tbl[] = {
+static const struct pci_device_id i810fb_pci_tbl[] = {
 	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82810_IG1,
 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
 	{ PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82810_IG3,