thermal: intel_pch_thermal: Enable Skylake PCH thermal

Enabled temperature reporting device of Skylake Platform Controller hub.
The register map is same as the wildcat point thermal currently implemented
in this driver.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>