Since the type of PcdStatusCodeUseSerial and PcdStatusCodeUseMemory
in MdeModulePkg.dec are changed, so change them from
PcdsFeatureFlag to PcdsFixedAtBuild in dsc files.
Cc: Maurice Ma <maurice.ma@intel.com> Reviewed-by: Guo Dong <guo.dong@intel.com> Cc: Benjamin You <benjamin.you@intel.com> Signed-off-by: Ming Tan <ming.tan@intel.com>