rtc: efi: switch to RTC_FEATURE_UPDATE_INTERRUPT

Stop using uie_unsupported and clear RTC_FEATURE_UPDATE_INTERRUPT instead.
Also the driver doesn't supports UIE because it doesn't handle interrupts
so set RTC_FEATURE_ALARM_WAKEUP_ONLY,.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220309162301.61679-24-alexandre.belloni@bootlin.com

drivers/rtc/rtc-efi.c

@@ -268,7 +268,8 @@ static int __init efi_rtc_probe(struct platform_device *dev)
 	platform_set_drvdata(dev, rtc);
 
 	rtc->ops = &efi_rtc_ops;
-	rtc->uie_unsupported = 1;
+	clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->features);
+	set_bit(RTC_FEATURE_ALARM_WAKEUP_ONLY, rtc->features);
 
 	return devm_rtc_register_device(rtc);
 }