When output height is eight, yscale of ps engine will be over two, it not support by pxp. According to pxp doc, a factor greater than 2 is not supported with the bilinear filter. so correct it when this case happen in order to ensure that pxp will be not hang up. Reviewed-by: Robby.cai <robby.cai@nxp.com> Signed-off-by: Guoniu.Zhou <guoniu.zhou@nxp.com>