Add PcdVTdPeiDmaBufferSize(S3) to replace the hard coded value TOTAL_DMA_BUFFER_SIZE and TOTAL_DMA_BUFFER_SIZE_S3 in IntelVTdPmrPei. Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>