power/stats: Move PowerStats HAL 2.0 to power/stats

Bug: 169864180
Test: dumpsys android.hardware.powerstats.IPowerStats/default
Change-Id: Icbadece98b09505efb2f6d0863f15d4b77a29df2
Merged-In: Icbadece98b09505efb2f6d0863f15d4b77a29df2
27 files changed