Add dependencies on libprocessgroup for sched_policy users

After moving sched_policy functions into libprocessgroup its users require
additional dependency and inclusion of sched_policy_ctrl.h header.

Exempt-From-Owner-Approval: janitorial

Bug: 111307099
Test: builds, boots

Change-Id: Icc052080e1bce46ce06f7264446950cab0490a95
Signed-off-by: Suren Baghdasaryan <surenb@google.com>