uefi: Add .sbat link_section

[JohnAZoidberg]

Validated with https://github.com/google/sbat-rs

> sbat-tool validate ./framework_uefi/build/x86_64-unknown-uefi/boot.efi

./framework_uefi/build/x86_64-unknown-uefi/boot.efi:
+----------------+-----+------------------------+----------------+---------+-------------------------------------------------------+
| component      | gen | vendor                 | package        | version | url                                                   |
+----------------+-----+------------------------+----------------+---------+-------------------------------------------------------+
| sbat           | 1   | SBAT Version           | sbat           | 1       | https://github.com/rhboot/shim/blob/main/SBAT.md      |
+----------------+-----+------------------------+----------------+---------+-------------------------------------------------------+
| framework_tool | 1   | Framework Computer Inc | framework_tool | 0.4.5   | https://github.com/FrameworkComputer/framework-system |
+----------------+-----+------------------------+----------------+---------+-------------------------------------------------------+

[JohnAZoidberg]

Still checking if this is useful, if we only sign this application and not microsoft/shim.