kernel - Force word-writes in syscons code (Intel hw character mode emulation)

kernel - Force word-writes in syscons code (Intel hw character mode emulation)

* Observed on the Intel D2500HN.  The system console in character map mode
  fails utterly when a normal bcopy() is used to move stuff around.  Employ
  a specialized bcopy that uses 16-bit writes to work around the problem.

* Just do this generally, we don't care about syscons performance.

* This is possibly due to a hardware/text-mode emulation in the Intel D2500HN
  and it will probably show up in the future as well.  This could be related
  to complaints about UEFI BIOSs (which the D2500HN mobo from Intel supports)
  not handling text mode, but it handles it just fine if we only use 16-bit
  writes.