video: fbdev: imsttfb: 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
6736 856 0 7592 1da8 drivers/video/fbdev/imsttfb.o

File size after adding 'const':
text data bss dec hex filename
6832 760 0 7592 1da8 drivers/video/fbdev/imsttfb.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/imsttfb.c

···
 	}
 }
 
-static struct pci_device_id imsttfb_pci_tbl[] = {
+static const struct pci_device_id imsttfb_pci_tbl[] = {
 	{ PCI_VENDOR_ID_IMS, PCI_DEVICE_ID_IMS_TT128,
 	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, IBM },
 	{ PCI_VENDOR_ID_IMS, PCI_DEVICE_ID_IMS_TT3D,