rtc: ds1511: call rtc_nvmem_register()

Call rtc_nvmem_register instead of letting the core do it and stop using
the nvmem_config member of struct rtc_device.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-ds1511.c

@@ -479,13 +479,14 @@ static int ds1511_rtc_probe(struct platform_device *pdev)
 	pdata->rtc->ops = &ds1511_rtc_ops;
 
 	ds1511_nvmem_cfg.priv = &pdev->dev;
-	pdata->rtc->nvmem_config = &ds1511_nvmem_cfg;
 	pdata->rtc->nvram_old_abi = true;
 
 	ret = rtc_register_device(pdata->rtc);
 	if (ret)
 		return ret;
 
+	rtc_nvmem_register(pdata->rtc, &ds1511_nvmem_cfg);
+
 	/*
 	 * if the platform has an interrupt in mind for this device,
 	 * then by all means, set it