msm: kgsl: set io_fraction to max for msm policy

io_fraction is set to max so that io_wait gets reported
for DCVS so that MP decision won't offline cores
during GPU activity.

Change-Id: I39db72dd9c443069675a8a1b1f4e17d8928625b8
Signed-off-by: Suman Tatiraju <sumant@codeaurora.org>