Exempt some broadcasts from FGS start restriction.

1. Exempt broadcasts ACTION_TIMEZONE_CHANGED, ACTION_TIME_CHANGED, ACTION_LOCALE_CHANGED
from FGS start restriction.
2. Add test case AlarmManagerServiceTest#setTimeZoneImpl.

Bug: 184111171
Test: atest frameworks/base/services/tests/mockingservicestests/src/com/android/server/alarm/AlarmManagerServiceTest.java
Change-Id: I80ce830d1bd98d69f35fdc6bcc041de173083fba