Frameworks: Native: Add PowerService support

Added underlying interface for PowerService that allows
sending power hints to PowerHAL.
This call handles the JNI code, and establishes a connection
with the service.

Bug 1155935
Bug 1206410

Change-Id: I49e8b24829fae5826dfe706ab0a107871a43f12c
Reviewed-on: http://git-master/r/191128
(cherry picked from commit 88509af1e958ab619b54c84f8a793a89af9c2ceb)
Reviewed-on: http://git-master/r/261382
GVS: Gerrit_Virtual_Submit
Reviewed-by: Mitch Luban <mluban@nvidia.com>
Reviewed-by: Rajesh Medisetty <rmedisetty@nvidia.com>
Tested-by: Rajesh Medisetty <rmedisetty@nvidia.com>
Reviewed-by: Thomas J. Meier <tmeier@nvidia.com>
Reviewed-by: Prajakta Gudadhe <pgudadhe@nvidia.com>