media: ttpci: budget-ci: constify pci_device_id

pci_device_id are not supposed to change at runtime. All functions
working with pci_device_id provided by <media/drv-intf/saa7146.h>
and <linux/pci.h> work with const pci_device_id. So mark the non-const
structs as const.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>