msm: kgsl: Do not allow use of invalid performance countables

On A4XX certain countables cannot be used as they are broken.
Enforce checks to make sure that these countables are not used.

Change-Id: Idf5e4c2e66369d1d1da014b8d046466468c12328
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>