Reduce log spam from MultiStateCounter

Most error reports are completely benign and caused by
minor race conditions leading to out-of-order timestamps, e.g.
```
12-21 10:59:19.015  1579  1710 E system_server: setState is called with an earlier timestamp: 367395029, previous timestamp: 367406095

```
Bug: 317382941
Test: atest libbattery_test

Change-Id: I44002818fac47436cb87765e77a64565b25cfea8