PM: devfreq: Allow userspace configuration of simple_ondemand

/sys/class/devfreq/fdb00000.qcom,kgsl-3d0/simple_ondemand

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
PM: devfreq: Use high priority workqueue

It does not make sense to run kgsl on high and devfreq on regular
priority.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm: Skip building perf debug

* Reduces non-important cruft.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>