soc: qcom: Add module parameter to pass cluster CPU IDs

Add a new module parameter to enable user space to pass
CPU IDs of the cluster for which policy min is to be adjusted.

min_freq_cluster: Takes as input the list of CPU IDs of the
cluster in string format with range, comma separated or both
such as "0-3","0,1,2,3", or "0,1-3".

Change-Id: Ibda7fce87cda99a111183407183fa1a7f8793c28
Signed-off-by: Ramakrishna Gottimukkula <rgottimu@codeaurora.org>