BatteryStats remove which - log warnings

In ag/6694908, BatteryStats is changed to only support the "which" of
STATS_SINCE_CHARGED. Here, we deal with BatteryStats calls that attempt
to use a different which, logging the event, exiting, and/or just using
STATS_SINCE_CHARGED as applicable.

Test: compiles
Bug: 70892428
Change-Id: Id0e9f863d8b1a5fb7baa770683c0c4ec5880e976