task_profiles.json: use system subgroup for NormalPerformance

Put tasks into a subgroup so that we can set things up e.g. soft cpu
bandwidth and/or uclamp.

Bug: 170507876
Bug: 171740453
Test: boot and check cgroup
Change-Id: Iaeb081bc4f214aa23eb281e0c28a81ea581bb4d1
1 file changed