[PATCH] drm/bochs: switch fb_ops over to use drm_fb_helper_cfb helpers

[Gerd Hoffmann]

  Hi,

> Hopefully Gerd has experience using bochs_drm with other non-x86
> systems
> and can comment further.

Just pushed to drm-misc-next, fix is correct.  bochs video memory is a
pci bar, and the framebuffer is stored there.

Using sys instead of cfb is probably a leftover from cirrus, where the
framebuffer actually in a shadow copy in system ram, due to the low
amout of (pci) video memory.

cheers,
  Gerd