MFC r256709:

  Eliminate unconditional debug printfs.

  Linux writes to these nominally read-only registers,
  so avoid having bhyve write warning messages to stdout
  when the reg writes can be safely ignored. Change the
  WPRINTF to DPRINTF which is conditional.

Approved by:	re (gjb)
MFC r256709:

  Eliminate unconditional debug printfs.

  Linux writes to these nominally read-only registers,
  so avoid having bhyve write warning messages to stdout
  when the reg writes can be safely ignored. Change the
  WPRINTF to DPRINTF which is conditional.

Approved by:	re (delphij)