drm/amdgpu: Add vbios attribute only if supported
Not all devices carry VBIOS version information. Add the device attribute only if supported. Signed-off-by: NLijo Lazar <lijo.lazar@amd.com> Reviewed-by: NLe Ma <le.ma@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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