Make auto time source suggestions prioritisation configurable.

Also get prefix is removed from Callback.getAutoOriginPriorities
to make it consistent with the rest of the interface.
Extra information added to TimeDetectorStrategyImpl dump.

Bug: 172230856
Test: atest
frameworks/base/services/tests/servicestests/src/com/android/server/timedetector

Change-Id: I2a67414d4f2b9d972507052c7c2c817d59be59ba