dt-bindings: Add snapshot of CX Ipeak cooling device devicetree binding

Add snapshot of CX Ipeak devicetree binding to the devicetree project.
This snapshot is taken as of 'commit <829fee7bd3d86> ("driver:
thermal: Update CX Ipeak driver to support CX Ipeak v1.1 hardware")'
of the msm-4.14 kernel project.

Change-Id: Ib661ebdfe21207f8e119819a870cbb0f459e290c