msm: kgsl: support busy stats based policy in tz

Gpu busy percentage based Dcvs policy requires more
arguments to the secure tz call. A new function is
required to support it.

Change-Id: I434a9bbc68d112378d10eb2795cef9ee65c3e23e
Signed-off-by: Suman Tatiraju <sumant@codeaurora.org>