Add more information to time detection logs

When receiving only dumpsys from time_detector, it can be useful to know
what the system clock time was before it was changed. The logging takes
place after the clock has been changed so this is currently missing.

Bug: 176316840
Test: build / treehugger only
Change-Id: I7441706cf5daaec5377289f215b15cad1d6de4f9