Since the type of PcdStatusCodeUseSerial and PcdStatusCodeUseMemory
in MdeModulePkg.dec are changed, so change them from
PcdsFeatureFlag to PcdsFixedAtBuild in dsc file.
Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Andrew Fish <afish@apple.com> Reviewed-by: Ray Ni <ray.ni@intel.com> Signed-off-by: Ming Tan <ming.tan@intel.com>