panel/innolux-ej030na: Use refcounted allocation in place of devm_kzalloc()

Move to using the new API devm_drm_panel_alloc() to allocate the
panel.

Reviewed-by: Neil Armstrong <[e-mail]>
Signed-off-by: Anusha Srivatsa <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/gpu/drm/panel/panel-innolux-ej030na.c

···
 	struct ej030na *priv;
 	int err;
 
-	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
+	priv = devm_drm_panel_alloc(dev, struct ej030na, panel,
+				    &ej030na_funcs,
+				    DRM_MODE_CONNECTOR_DPI);
+	if (IS_ERR(priv))
+		return PTR_ERR(priv);
 
 	priv->spi = spi;
 	spi_set_drvdata(spi, priv);
···
 	if (IS_ERR(priv->reset_gpio))
 		return dev_err_probe(dev, PTR_ERR(priv->reset_gpio),
 				     "Failed to get reset GPIO\n");
-
-	drm_panel_init(&priv->panel, dev, &ej030na_funcs,
-		       DRM_MODE_CONNECTOR_DPI);
 
 	err = drm_panel_of_backlight(&priv->panel);
 	if (err)