rtc: ac100: use rtc_lock/rtc_unlock

Avoid accessing directly rtc->ops_lock and use the RTC core helpers.

Signed-off-by: Alexandre Belloni <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/rtc/rtc-ac100.c

···
 	unsigned int val = 0;
 	int ret;
 
-	mutex_lock(&chip->rtc->ops_lock);
+	rtc_lock(chip->rtc);
 
 	/* read status */
 	ret = regmap_read(regmap, AC100_ALM_INT_STA, &val);
···
 	}
 
 out:
-	mutex_unlock(&chip->rtc->ops_lock);
+	rtc_unlock(chip->rtc);
 	return IRQ_HANDLED;
 }