V4L2 describes multi-planar formats with different 4CCs depending on whether or not the planes are stored contiguously in memory. Support this when translating between PixelFormat and V4L2PixelFormat. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Hirokazu Honda <hiroh@chromium.org> Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>