msm: kgsl: Add support for cx-ipeak victim registration

CX-ipeak victim registration will allow to throttle GPU
frequency based on CX-ipeak HW interrupt. There will
be callback from CX-ipeak driver upon HW interrupt to
handle frequency throttling.

Change-Id: I08f6bb277f23abc2aa5372097485845d6082c075
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>