WhiskeylakeOpenBoardPkg/WhiskeylakeURvp: Add DSC and build files

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2083



Adds the DSC and build files necessary to build the
WhiskeylakeURvp board instance.

Key files
=========
* build_config.cfg - Board-specific build configuration file.
* OpenBoardPkg.dsc - The WhiskeylakeURvp board description file.
* OpenBoardPkgConfig.dsc - Used for feature-related PCD
  customization.
* OpenBoardPkgPcd.dsc - Used for other PCD customization.
* OpenBoardPkg.fdf - The WhiskeylakeURvp board flash file.
* FlashMapInclude.fdf - The WhiskeylakeURvp board flash map.
* OpenBoardPkgBuildOption.dsc - Sets build options Based
  on PCD values.

Cc: Sai Chaganty <rangasai.v.chaganty@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@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>