For computing PCIe bandwidth in userspace and troubleshooting PCIe
bandwidth issues.

For example, my Navi21 has been limited to PCIe gen 1 and this is
the first time I noticed it after 2 years.

Note that this intentionally fills a hole and padding
in drm_amdgpu_info_device.

Signed-off-by: Marek Olšák <marek.olsak@amd.com>

The patch is attached.

Marek