platform/x86: intel/pmc: Relocate Cannon Lake Point PCH support

Create cnp.c for Cannon Lake Point PCH specific structures and init().
This file supports Cannon Lake and Comet Lake platforms.
There are no functional changes involved.

Cc: David E Box <david.e.box@linux.intel.com>
Reviewed-by: "David E. Box" <david.e.box@linux.intel.com>
Signed-off-by: Xi Pardee <xi.pardee@intel.com>
Signed-off-by: "David E. Box" <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20221114183257.2067662-5-gayatri.kammela@linux.intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>