drm/rockchip: Remove unneeded semicolon

Fixes coccicheck warning:

drivers/gpu/drm/rockchip/cdn-dp-reg.c:604:2-3: Unneeded semicolon
drivers/gpu/drm/rockchip/cdn-dp-reg.c:622:2-3: Unneeded semicolon
drivers/gpu/drm/rockchip/cdn-dp-reg.c:703:2-3: Unneeded semicolon

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zheng Bin <zhengbin13@huawei.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20200424074410.1070-1-zhengbin13@huawei.com

drivers/gpu/drm/rockchip/cdn-dp-reg.c

@@ -601,7 +601,7 @@ static int cdn_dp_get_msa_misc(struct video_info *video,
 	case YCBCR_4_2_0:
 		val[0] = 5;
 		break;
-	};
+	}
 
 	switch (video->color_depth) {
 	case 6:
@@ -619,7 +619,7 @@ static int cdn_dp_get_msa_misc(struct video_info *video,
 	case 16:
 		val[1] = 4;
 		break;
-	};
+	}
 
 	msa_misc = 2 * val[0] + 32 * val[1] +
 		   ((video->color_fmt == Y_ONLY) ? (1 << 14) : 0);
@@ -700,7 +700,7 @@ int cdn_dp_config_video(struct cdn_dp_device *dp)
 	case 16:
 		val = BCS_16;
 		break;
-	};
+	}
 
 	val += video->color_fmt << 8;
 	ret = cdn_dp_reg_write(dp, DP_FRAMER_PXL_REPR, val);