Copy V4L2_PIX_FMT_P010 define from linux header. V4L2_PIX_FMT_P010 is the little endian definition of P010 so map it GST_VIDEO_FORMAT_P010_10LE. Add it v4l2 default video formats to allows v4l2 decoders to enumerate and use it. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2590>