Add force-suspend functionality to SystemSuspend.

Bug: 111991113
Test: manual - 'adb shell svc power forcesuspend'
Change-Id: I951c7586602d8ed5a7eccdfcd68008815c12510d
Merged-In: I951c7586602d8ed5a7eccdfcd68008815c12510d
(cherry picked from commit 9c4ea220414209f61e868cb28a9838607fec13a8)
5 files changed