rtc: au1xxx: set range

The Alchemy counter0 is a 32bit seconds counter.

Link: https://lore.kernel.org/r/20200306005958.39203-3-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-au1xxx.c

@@ -100,6 +100,7 @@ static int au1xtoy_rtc_probe(struct platform_device *pdev)
 		return PTR_ERR(rtcdev);
 
 	rtcdev->ops = &au1xtoy_rtc_ops;
+	rtcdev->range_max = U32_MAX;
 
 	platform_set_drvdata(pdev, rtcdev);