rtc: Fix race when disable/enable UIE in rtc_set_time()

hulk inclusion
category: bugfix
bugzilla: 186781, https://gitee.com/openeuler/kernel/issues/I61CEW


CVE: NA

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When the RTC_SET_TIME and RTC_RD_TIME threads run in parallel,
there is no guarantee that uie_rtctimer.enabled is equal to the
previously read uie when executing rtc->ops->set_time.

Fix this by keeping reading uie state, disabling uie, setting
rtc time and enabling uie in critical sections.

Fixes: 7e7c005b ("rtc: disable uie before setting time and enable after")
Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>