Update delivery group policy for TIME_CHANGED and TIMEZONE_CHANGED.

Applying the DELIVERY_GROUP_POLICY_MOST_RECENT policy to TIME_CHANGED
and TIMEZONE_CHANGED broadcasts so that the older broadcasts can be
discarded when a new one comes in. Since they are already using
the FLAG_RECEIVER_REPLACE_PENDING, it should be safe to apply this
policy.

Bug: 311288757
Test: atest CtsAlarmManagerTestCases
Test: atest services/tests/mockingservicestests/src/com/android/server/alarm/AlarmManagerServiceTest.java
Change-Id: Iada16830fa05d93e2a85c0a2d06ee31c0470cb4a