drm/vc4: vec: Switch to devm_pm_runtime_enable

devm_pm_runtime_enable() simplifies the driver a bit since it will call
pm_runtime_disable() automatically through a device-managed action.
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220711173939.1132294-62-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_vec.c

@@ -583,42 +583,32 @@ static int vc4_vec_bind(struct device *dev, struct device *master, void *data)
 		return ret;
 	}
 
-	pm_runtime_enable(dev);
+	ret = devm_pm_runtime_enable(dev);
+	if (ret)
+		return ret;
 
 	ret = drmm_encoder_init(drm, &vec->encoder.base,
 				NULL,
 				DRM_MODE_ENCODER_TVDAC,
 				NULL);
 	if (ret)
-		goto err_put_runtime_pm;
+		return ret;
 
 	drm_encoder_helper_add(&vec->encoder.base, &vc4_vec_encoder_helper_funcs);
 
 	ret = vc4_vec_connector_init(drm, vec);
 	if (ret)
-		goto err_put_runtime_pm;
+		return ret;
 
 	dev_set_drvdata(dev, vec);
 
 	vc4_debugfs_add_regset32(drm, "vec_regs", &vec->regset);
 
 	return 0;
-
-err_put_runtime_pm:
-	pm_runtime_disable(dev);
-
-	return ret;
-}
-
-static void vc4_vec_unbind(struct device *dev, struct device *master,
-			   void *data)
-{
-	pm_runtime_disable(dev);
 }
 
 static const struct component_ops vc4_vec_ops = {
 	.bind   = vc4_vec_bind,
-	.unbind = vc4_vec_unbind,
 };
 
 static int vc4_vec_dev_probe(struct platform_device *pdev)