rtc: fsl-ftm-alarm: report alarm to core

Report interrupt state to the RTC core.
Signed-off-by: Biwen Li <biwen.li@nxp.com>
Link: https://lore.kernel.org/r/20200327084457.45161-1-biwen.li@nxp.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-fsl-ftm-alarm.c

@@ -152,6 +152,8 @@ static irqreturn_t ftm_rtc_alarm_interrupt(int irq, void *dev)
 {
 	struct ftm_rtc *rtc = dev;
 
+	rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
+
 	ftm_irq_acknowledge(rtc);
 	ftm_irq_disable(rtc);
 	ftm_clean_alarm(rtc);