msm: kgsl: manage active count for perfcounter read compat ioctl

The perfcounter read ioctl forces the power on by getting an
active count. Mimic this strategy for the equivalent compat ioctl.

Change-Id: I00c13ea4266971ed6bbb4f6c5e1373813a5406d8
Signed-off-by: Shrenuj Bansal <shrenujb@codeaurora.org>