soc: qcom: msm_perf: fix invalid usage of dev freq qos apis

msm_perf is attempting to add freq qos requests without waiting
for policy create notifications.
This may cause corruption at latter point of time when it
attempts to trigger freq qos update requests.
The changes registers for policy create notifications and
defers the add requests until dev freq is up.

Change-Id: Idee4268ded948062e627cc4dcdf85ceaf48e5ce7
Signed-off-by: Kishore Sri venkata Ganesh Bolisetty <bsrivenk@codeaurora.org>