Fix *_s_std prototype
Remove current_norm from video_device templates
Add support for struct v4l2_device

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Ismael Luceno <ismael.luceno@corp.bluecherry.net>