soc: qcom: msm_perf: Allow freq updates regardless of policy

If frequency update is not honored in cases where it matches to the
previous update, the previous policy update may be revoked any time
and desired performance may drop before the usecase completeion of
the current frequency update.

Change-Id: Ib626f04ecdd343b767c3e0609863a9b8d30f5187
Signed-off-by: Kishore Sri venkata Ganesh Bolisetty <bsrivenk@codeaurora.org>