drm/mediatek: ovl: Remove the color format comment for ovl_fmt_convert()

Since we changed MACROs to be consistent with DRM input color format
naming, the comment for ovl_fmt_conver() is no longer needed.

Fixes: 9f428b9 ("drm/mediatek: Add new color format MACROs in OVL")
Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20241009034646.13143-4-jason-jh.lin@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

Author: Jason-JH.Lin

drivers/gpu/drm/mediatek/mtk_disp_ovl.c

@@ -389,11 +389,6 @@ void mtk_ovl_layer_off(struct device *dev, unsigned int idx,
 static unsigned int ovl_fmt_convert(struct mtk_disp_ovl *ovl, unsigned int fmt,
 				    unsigned int blend_mode)
 {
-	/* The return value in switch "MEM_MODE_INPUT_FORMAT_XXX"
-	 * is defined in mediatek HW data sheet.
-	 * The alphabet order in XXX is no relation to data
-	 * arrangement in memory.
-	 */
 	switch (fmt) {
 	default:
 	case DRM_FORMAT_RGB565: