msm: kgsl: Convert the Adreno GPU cycle counters to run free

In anticipation of allowing multiple entities to share access to the
performance counters; make the few performance counters that KGSL
uses run free.

Change-Id: Ic0dedbadbefb400b04e4f3552eed395770ddbb7b
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>