Document a private ioctl range for wscons drivers (from Miod). Therefore
change the UDLIO_DAMAGE ioctl from 0 to 128 and move the ioctl part from
udl.h to udlio.h so we can include it in userland ap

Document a private ioctl range for wscons drivers (from Miod). Therefore
change the UDLIO_DAMAGE ioctl from 0 to 128 and move the ioctl part from
udl.h to udlio.h so we can include it in userland applications.

Suggested and OK miod@

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