Handle multi-GPU EFI systems better

[Matthew Garrett]

Right now we assume that the GPU with the legacy VGA routing is the active
video device. This holds for BIOS systems, but falls down quite badly on
EFI-based systems. This patchset adds support for cleaning that up and
has been confirmed to work on an Apple machine with dual GPUs.

-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx

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