Add power stats service for specific device

Bug: 183052760
Test: dumpsys android.hardware.power.stats.IPowerStats/default
Change-Id: I20fa0e1b369f9b5f15e7881eea87ef699176dccc
Merged-In: I20fa0e1b369f9b5f15e7881eea87ef699176dccc
13 files changed