hal: Add libprocessgroup dependency to set_sched_policy users

Add libprocessgroup dependency to audio hal that uses set_sched_policy.
Include sched_policy_ctrl.h header which now contains set_sched_policy
definition.

Exempt-From-Owner-Approval: janitorial

Bug: 111307099
Test: builds, boots

Change-Id: I8286daed7065c405ca06e87c1b8f6f6c301dc388
Signed-off-by: Suren Baghdasaryan <surenb@google.com>