drivers: thermal: lmh-dcvsh: Add multiple clock plan support

A single LMH DCVSh hardware can mitigate CPUs with different clock plan
operating in a single voltage rail.

Add support in LMH DCVSh driver to treat individual CPU to have
different clock plan. Hence all the throttling frequencies are compared
against each individual CPUs.

Change-Id: I566985a45007bf6939fa315a9471bbba4e5df7de
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>