sched: Update the number of tune groups to 5

The schedtune controller will mimic the cpusets controller configuration
for now. For that we need to make 4 groups in addition to the root
group present by default.

Change-Id: I082f1e4e4ebf863e623cf66ee127eac70a3e2716
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>