powerstats: remove common data providers in specific directory

The common data providers will be moved to gs common directory. So
I removed them in this directory and used gs common library to get
the APIs.

Bug: 206576142
Test: dumpsys android.hardware.power.stats.IPowerStats/default
Change-Id: I81e7a957490fb563fdf25a6434aaf5e886456c5d
Signed-off-by: Darren Hsu <darrenhsu@google.com>
11 files changed