Add new thermal control mechanism for pch device under dptf driver. This provides support of different control knobs for FIVR. BUG=b:198582766 BRANCH=None TEST=Build FW and test on brya0 board Change-Id: I035d2844b9ba6a9532ae006fc1c43e34cb94328a Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/57096 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>