V4L/DVB (13027): go7007: convert printks to v4l2_info

Use v4l2_info and v4l2_err where appropriate.

Signed-off-by: Pete Eberlein <pete@sensoray.com>
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>