drm/sun4i: tv: Add missing reset assertion

The reset line is deasserted at bind, and asserted if we ever encounter an
error there. However, it's never asserted in unbind which will lead to a
resource unbalance.
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220728-rpi-analog-tv-properties-v2-40-459522d653a7@cerno.tech

drivers/gpu/drm/sun4i/sun4i_tv.c

@@ -610,6 +610,7 @@ static void sun4i_tv_unbind(struct device *dev, struct device *master,
 	drm_connector_cleanup(&tv->connector);
 	drm_encoder_cleanup(&tv->encoder);
 	clk_disable_unprepare(tv->clk);
+	reset_control_assert(tv->reset);
 }
 
 static const struct component_ops sun4i_tv_ops = {