devmouse: refactor screen blanking logic

devmouse controls the screen blanking timeout, so move the
code there avoiding cross calls between modules. the only
function that needs to be provided is blankscreen(), which
gets called with drawlock locked.

the blank timeout is set thru /dev/mousectl now, so kernels
without devvga can set it.

blanking now only happens while /dev/mouse is read. so this
avoids accidentally blanking the screen on cpu servers that
do not have a mouse to unblank it.

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