DO NOT MERGE: Revert "Revert "Add libprocessgroup dependency and fix sched_policy include""

This reverts commit f145309d.

Reason for revert: AOSP is fixed with new vendor image

Change-Id: If522adf1ea36e7792b1ae26234ec2bdb2756bdfd
Signed-off-by: Suren Baghdasaryan <surenb@google.com>