Reverse ReferenceWithHistory.dump() order

This commit switches the ordering of ReferenceWithHistory.dump() so the oldest
entries are output first followed by newer ones, i.e. traditional log ordering.

Tests are updated to confirm ReferenceWithHistory dump output.

Bug: 204855374
Test: atest services/tests/servicestests/src/com/android/server/timedetector/ReferenceWithHistoryTest.java
Test: adb shell dumpsys time_zone_detector
Change-Id: Ia098492fc6056fdbb8ef9d8ca1128bf0f51d113b