video: fbdev: neofb: 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
  12766	   1064	     21	  13851	   361b	drivers/video/fbdev/neofb.o

File size after adding 'const':
   text	   data	    bss	    dec	    hex	filename
  13086	    744	     21	  13851	   361b	drivers/video/fbdev/neofb.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/neofb.c

@@ -2138,7 +2138,7 @@ static void neofb_remove(struct pci_dev *dev)
 	}
 }
 
-static struct pci_device_id neofb_devices[] = {
+static const struct pci_device_id neofb_devices[] = {
 	{PCI_VENDOR_ID_NEOMAGIC, PCI_CHIP_NM2070,
 	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, FB_ACCEL_NEOMAGIC_NM2070},