V4L/DVB (5464): Set the PCI device in the V4L2 device

Set the PCI dev in the V4L2 dev so that the proper sysfs link gets made

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>