CoffeelakeSiliconPkg: Add package and Include headers

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2082



Create the CoffeelakeSiliconPkg to provide an initial package for
silicon initialization code for Coffee Lake (CFL) and Whiskey Lake
(WHL) generation products.

* Major areas of functionality are categorized into CPU, Management
  Engine (ME), Platform Controller Hub (PCH), and System Agent
  subdirectories.
* Common libraries and headers are kept at the root of the package.

Cc: Sai Chaganty <rangasai.v.chaganty@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Ankit Sinha <ankit.sinha@intel.com>
Signed-off-by: Michael Kubacki <michael.a.kubacki@intel.com>
Reviewed-by: Sai Chaganty <rangasai.v.chaganty@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Reviewed-by: Ankit Sinha <ankit.sinha@intel.com>