the following message is not supported.

PPSMC_MSG_ReadSerialNumTop32
PPSMC_MSG_ReadSerialNumBottom32
Signed-off-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>