video: fbdev: nvidia: 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
12149 768 36 12953 3299 video/fbdev/nvidia/nvidia.o

File size after adding 'const':
text data bss dec hex filename
12213 704 36 12953 3299 video/fbdev/nvidia/nvidia.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/nvidia/nvidia.c

···
 /* HW cursor parameters */
 #define MAX_CURS		32
 
-static struct pci_device_id nvidiafb_pci_tbl[] = {
+static const struct pci_device_id nvidiafb_pci_tbl[] = {
 	{PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
 	 PCI_BASE_CLASS_DISPLAY << 16, 0xff0000, 0},
 	{ 0, }