lets use linux default value for sched_latency_ns

this was a tweak I used in ATOM-422.  it sets the minimum time a task will
be allowed to run on CPU before being pre-emptied out. The stock value for
Linux is 4 ms. the stock value for android is 10 ms.

Change-Id: I8fb11a25a0daa618b6e3353b2d316e02d15e57a2