remove additional V4L2 pixelformat defines
remove additional V4L2 pixelformat defines

they are upstream since at least linux 2.6.8 (10 Years)
http://lxr.oss.org.cn/ident?v=2.6.8&i=V4L2_PIX_FMT_SBGGR8
opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv