V4L/DVB (13222): pvrusb2: Make more info available to udev

pvrusb2: Associate V4L device node in sysfs with the underlying USB
device.  This opens the door to device information tracking in udev

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>