[DO NOT MERGE] Update kernel timezone if call to setTime causes DST offset to change

If AlarmManager#setTime is called with a time that has a different DST
offset than the current system time, update the kernel timezone offset
with the correct value for the time being set.

Test: Manually set time to two times with different DST offsets, ensure
kernel time zone updates properly.

Bug: 80098370
Change-Id: I8884bce471cf4b95372d6d33a36e8c9e92bd6a96