Make BatteryStatsHistoryIterator API compatible with Iterator

Bug: 261622968
Test: make RunSettingsRoboTests ROBOTEST_FILTER=com.google.android.settings.fuelgauge.BatteryInfoTest  RELAX_USES_LIBRARY_CHECK=true

Change-Id: I4b3cf18e4714017b412485120557eb22d7039118
2 files changed