drm/mediatek: dp: Remove extra semicolon

Remove unnecessary semicolon at the end of switch block closing brace.
Issue identified using semicolon Coccinelle semantic patch.
Signed-off-by: Deepak R Varma <drv@mailo.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/Y8LNIt97qxLk8e70@ubun2204.myguest.virtualbox.org/Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

drivers/gpu/drm/mediatek/mtk_dp.c

@@ -1693,7 +1693,7 @@ static int mtk_dp_training(struct mtk_dp *mtk_dp)
 				break;
 			default:
 				return -EINVAL;
-			};
+			}
 			continue;
 		}