Some work on the ATA/ATAPI seek latency feature
- seek-only commands now using this feature
- fixed possible strange error message at hard disk DMA reads caused by wrong
  bmdma_start_transfer() call.


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12200 6c8e4198-a580-4521-a02f-c9ae86df1db9