thermal: intel: intel_pch_thermal: Add Cannon Lake Low Power PCH support

Add LP (Low Power) PCH id for Cannon Lake (CNL) based platforms.

Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1596097503-27924-1-git-send-email-sumeet.r.pawnikar@intel.com