V4L/DVB (8959): include <linux/videodev2.h> into linux/ivtv.h

linux/videodev2.h defines enum v4l2_buf_type and struct v4l2_rect

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>