ClevoOpenBoardPkg: Add package and headers

Based on KabylakeOpenBoardPkg from the following branch:
https://github.com/tianocore/edk2-platforms/tree/devel-MinPlatform



Create the ClevoOpenBoardPkg to provide an initial board package
for Clevo boards. The ClevoOpenBoardPkg is intended to contain a
series of specific Clevo board instances such as the N1XXWU and
N1XXZU series. A given board instance serves as a board
implementation for use with the MinPlatformPkg.

* Common resources are shared at the top-level of ClevoOpenBoardPkg.
* Features are organized into the Features directory.
  * Features not mandatory to load the OS in the standard hardware
    configuration are considered advanced and only enabled when
    gMinPlatformPkgTokenSpaceGuid.PcdBootStage is greater than 5.

Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kubacki <michael.a.kubacki@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>