WhitleyOpenBoardPkg/Smbios: Add SMBIOS PCD

This adds PCD that need to be produced by the board port to properly
populate the FvOpenBoardPkg SMBIOS support and generate reasonable
SMBIOS tables.

Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Signed-off-by: Isaac Oram <isaac.w.oram@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>