V4L/DVB (13024): go7007: Implement vidioc_g_std and vidioc_querystd

Implemented the vidio_g_std and vidio_querystd ioctls.

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>