drm/rockchip: remove unneeded semicolon from vop2 driver

Eliminate the following coccicheck warning:
./drivers/gpu/drm/rockchip/rockchip_drm_vop2.c:1476:2-3: Unneeded
semicolon
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220505232659.4405-1-yang.lee@linux.alibaba.com

drivers/gpu/drm/rockchip/rockchip_drm_vop2.c

@@ -1473,7 +1473,7 @@ static void rk3568_set_intf_mux(struct vop2_video_port *vp, int id,
 	default:
 		drm_err(vop2->drm, "Invalid interface id %d on vp%d\n", id, vp->id);
 		return;
-	};
+	}
 
 	dip |= RK3568_DSP_IF_POL__CFG_DONE_IMD;