T480/T480S: Support fetching ThunderBolt firmware

Though not used in coreboot builds, and not injected into the
builds in any way, these files are now created seperately when
handling T480/T480s vendor files:

vendorfiles/t480/tb.bin
vendorfiles/t480s/tb.bin

These are created by extracting Lenovo's ThunderBolt firmware
from update files. The updated firmware fixes a bug; older firmware
enabled debug commands that wrote logs to the TB controller's
own flash IC, and it'd get full up with logs, bricking the controller.
If you've already been screwed by this, you must flash externally,
using a padded firmware from Lenovo's updates.

Lenovo's own updater requires creating a boot CD or booting
Windows. This patch in lbmk auto-downloads just the firmware,
and you can flash it externally.

You could simply do this as a matter of course, when installing
Libreboot. You are recommended to update the Lenovo UEFI/EC firmwares
first, before installing Libreboot; please look at the Libreboot
documentation to know exactly which versions.

Then dump the ThunderBolt firmware first, to be sure, and then you
can flash these files. Flashing these updates will prevent the bug
described here:

https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/thinkpad-t-series-laptops/thinkpad-t480-type-20l5-20l6/20l5/solutions/ht508988

You can download Lenovo's installers for various ThinkPad models
there, including T480s/T480s. It is these downloads that this lbmk
patch uses, to extract those files directly.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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