video: fbdev: tridentfb: 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
13206 1232 40 14478 388e video/fbdev/tridentfb.o

File size after adding 'const':
text data bss dec hex filename
13910 528 40 14478 388e video/fbdev/tridentfb.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/tridentfb.c

···
 }
 
 /* List of boards that we are trying to support */
-static struct pci_device_id trident_devices[] = {
+static const struct pci_device_id trident_devices[] = {
 	{PCI_VENDOR_ID_TRIDENT,	BLADE3D, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEi7, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEi7D, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},