panel/magnachip-d53e6ea8966: 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-magnachip-d53e6ea8966.c

···
 		.node = NULL,
 	};
 
-	db = devm_kzalloc(dev, sizeof(*db), GFP_KERNEL);
-	if (!db)
-		return -ENOMEM;
+	db = devm_drm_panel_alloc(dev, struct d53e6ea8966, panel,
+				  &d53e6ea8966_panel_funcs,
+				  DRM_MODE_CONNECTOR_DSI);
+	if (IS_ERR(db))
+		return PTR_ERR(db);
 
 	spi_set_drvdata(spi, db);
 
···
 	db->dsi_dev->format = MIPI_DSI_FMT_RGB888;
 	db->dsi_dev->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
 			  MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET;
-
-	drm_panel_init(&db->panel, dev, &d53e6ea8966_panel_funcs,
-		       DRM_MODE_CONNECTOR_DSI);
 
 	if (db->panel_info->backlight_register) {
 		ret = db->panel_info->backlight_register(db);