drm/amdgpu: bind to any 0x1002 PCI diplay class device

Bind to all 0x1002 GPU devices.

For now we explicitly return -ENODEV for generic bindings.
Remove this check once IP discovery based checking is in place.

v2: rebase (Alex)

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>