msm: kgsl: Disable microcode save/restore of perf counter values on A6x

Setting this ordinal in the microcode prevents the GPU from saving
and restoring the performance counter values across preemption. This
allows the counters to also be used for global measurements since
the values are strictly increasing.

Change-Id: I169a85d93f5d03b09365d76f2fdea54d3ff0fb6c
Signed-off-by: Jonathan Wicks <jwicks@codeaurora.org>