Add local service interface for app hibernation

Adds a local service interface for app hibernation service that lets
other system services in system server call into app hibernation service
directly.

Bug: 175829330
Test: builds
Change-Id: Iad830fa1f380c741674ef257db9d8d7830be6592
Merged-In: Iad830fa1f380c741674ef257db9d8d7830be6592