msm: npu: Support cx ipeak limit management

This change is to support cx ipeak limit management in order to
allow sysmon to limit cx currrent by adjusting npu power level.

Change-Id: I98cfdd1a27e13fc69151f077ffc38f50405b95c2
Signed-off-by: Da Hoon Pyun <dpyun@codeaurora.org>