msm: thermal: Add new IOCTL commands to mitigate cluster based devices

Add new IOCTL command to mitigate the maximum and
minimum frequency of a synchronous cluster.

Add new command to get the clock frequency plan
for a cluster.

change-Id: I82cdcb3529ae9cce03c46cfddedc68ae56aaf9ea
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>