V4L/DVB: usbvision: don't use usb_set_intfdata, let v4l2_device_register handle this

v4l2_device_register already sets intfdata, no need to do this again.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>