Initial work to bring this driver in par with other sparc frame buffers:

- do not reprogram the colormap to black and white, after programming
  the rasops one (oops). This gives us back a black on white display
  with colour support.
- if the screen resolution would cause the switch from the prom font to
  a reasonably sized wsfont to leave text in the margins, clear the
  screen (cut and paste from similar code in vigra.c)
- try and use more symbolic constants rather than magical values all over
  the place.

Thanks to millert@ for bringing a sparcbook here.

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