Add a define and use it with MaxLogicalProcessorNumber to enable this PCD to be changed via the command line. Quark needs to set this value to one during the builds. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com> Reviewed-by: Prince Agyeman <prince.agyeman@intel.com>