libprocessgroup: Replace stune with utilclamp profiles

Replace schedtune out-of-tree controller's usage in the performance
profiles with utilclamp controller. Stop mounting schedtune controller.

Bug: 170507876
Test: cpuctl groups worked
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Ib7fa6c902581398587c75414845c2ff6c8bdb005