drm/amd/display: Make sure DSC slice height is divisible by 2 for 4:2:0 color format

	dsc_cfg->num_slices_h = num_slices_h;

	slice_width = pic_width / num_slices_h;

	// Vertical number of slices: start from policy and pick the first one that height is divisible by

	// Vertical number of slices: start from policy and pick the first one that height is divisible by.

	// For 4:2:0 make sure the slice height is divisible by 2 as well.

	pic_height = timing->v_addressable + timing->v_border_top + timing->v_border_bottom;

	num_slices_v = dsc_policy.num_slices_v;

	if (num_slices_v < 1)

		num_slices_v = 1;

	while (num_slices_v >= 1 && (pic_height % num_slices_v != 0))

	while (num_slices_v >= 1) {

		if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) {

			int slice_height = pic_height / num_slices_v;

			if (pic_height % num_slices_v == 0 && slice_height % 2 == 0)

				break;

		} else if (pic_height % num_slices_v == 0)

			break;

		num_slices_v--;

	}

	dsc_cfg->num_slices_v = num_slices_v;