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During setting RTC time, driver will halt RTC update. So support bit 7 of reg_b. When it set to 0, time will be updated. And when it's set to 1, rtc will keep the second it was set. In the process of getting RTC time, driver sets alarm interrupt, waits 1s, and get alarm interrupt flag. So support alarm interrupt flag update. If alarm interrupt is enabled (bit 5, reg_b set to 1), interrupt flag register will be set (bit 7 & bit 5 of reg_c) at appropriate time. Tracked-On: #7440 Signed-off-by: Yuanyuan Zhao <yuanyuan.zhao@linux.intel.com> Reviewed-by: Junjie Mao <junjie.mao@intel.com>