msm: kgsl: sensor: Proper handling of race condition in util api

Power count is coming from user space which can be modified due to
access to shared memory. This change scopes the data locally so
as to avoid vulnerability of count being modified by external
means while executing due to being in shared memory.

CRs-Fixed: 3691744.

Change-Id: Ia8c23000787aeb16c46d7f9c8eea68fcdd871d58
Signed-off-by: Shivi Mangal <quic_smangal@quicinc.com>
Signed-off-by: Guang Yang <quic_guyang@quicinc.com>