Use generic SerialDxe driver in MdeModulePkg instead of the one in CorebootModulePkg. By doing this the reference for PciSioSerialDxe driver will also be removed from DSC and FDF file. Cc: Prince Agyeman <prince.agyeman@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Maurice Ma <maurice.ma@intel.com> Reviewed-by: Lee Leahy <leroy.p.leahy@intel.com>