make fbdev/fbcon switchable per driver?

[Gerd Hoffmann]

  Hi folks,

Problem at hand:  A virtual machine, equipped with two display devices,
one virtual, one physical (using pci pass-through, or kvmgt-based vgpu).

There is no easy way for the user to configure which of the two display
devices fbcon should run on.  i915 happens to win over bochs-drm or qxl,
so you can't use the emulated gfx device as text console.

One way out would be to add a module option to each driver, to turn off
fbdev emulation.  Attached patch does that for i915.

Comments?  Better ideas?

cheers,
  Gerd

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