fbdevhw: Refuse to touch PCI devices on the fallback probe path

Fixes: xorg/driver/xf86-video-fbdev#9
Signed-off-by: Adam Jackson <ajax@redhat.com>
(cherry picked from commit fc78bcca)
1 job for server-1.20-branch in 3 minutes and 2 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #28578
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