video: fbdev: atyfb: 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
  17534	   1824	     48	  19406	   4bce	video/fbdev/aty/atyfb_base.o

File size after adding 'const':
   text	   data	    bss	    dec	    hex	filename
  18686	    672	     48	  19406	   4bce	video/fbdev/aty/atyfb_base.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/aty/atyfb_base.c

@@ -3756,7 +3756,7 @@ static void atyfb_pci_remove(struct pci_dev *pdev)
 	atyfb_remove(info);
 }
 
-static struct pci_device_id atyfb_pci_tbl[] = {
+static const struct pci_device_id atyfb_pci_tbl[] = {
 #ifdef CONFIG_FB_ATY_GX
 	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_CHIP_MACH64GX) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_CHIP_MACH64CX) },