[VM][UPD71071][DONOTBUILD][WIP] Appling new APIs.But still not complete due to below:

[VM][UPD71071][DONOTBUILD][WIP] Appling new APIs.But still not complete due to below:

- [VM][FMTOWNS][DMAC][SCSI] This aims to integrate FM-Towns's DMAC.
- Newer FM-Towns's SCSI HOST has both 16bit DMA transfer mode and 8bit DMA
  transfer mode.
  This feature make wrong transfer with MS-DOS v6 (also MS-DOS v5?).
  Seems to be assumed 16bit DMA transfer even not support 16bit DMA.
  i.e) FM-Towns 2H.
  BTW, this must implement workaround.
  In eFM-Towns, very ugly workaround to solve this issue.
  But, with this change, I wish to more simpler workaround.
  Please wait.