drivers: thermal: Add support for limits cpu voltage cooling device

Add support for limits cpu voltage cooling device driver. The LMH CPU
voltage cooling device will be used to place VDD restriction vote to
limits hardware on cold thermal condition. This cooling device driver
can register one cooling device per LLM, which can be used by thermal
zone to place VDD restriction vote.

Change-Id: I81aebcba3ab8d2db17b98b41c554067078edcb9f
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>