[XS] Change in coreboot[master]: arch/x86/smbios: Add weak function for BIOS Vendor in SMBIOS Type0

[Martin L Roth (Code Review)]

Attention is currently required from: Angel Pons, Arthur Heymans, Eric Lai, Felix Held, Jeff Li, Johnny Lin, Jonathan Zhang, Lean Sheng Tan, Martin Roth, Nill Ge, Subrata Banik, TangYiwei, Ziang Wang, [e-mail].

Martin L Roth has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/75737?usp=email )

Change subject: arch/x86/smbios: Add weak function for BIOS Vendor in SMBIOS Type0
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Patch Set 1:

(1 comment)

Patchset:

PS1:
> Patch like this? […]

Right, but I'm not even sure that the ifdef is required, because the value should always be present in Kconfig after we set it there. You can look at how CONFIG_MAINBOARD_SERIAL_NUMBER is used.

```
config BIOS_VENDOR
        string
        prompt "SMBIOS BIOS_VENDOR string" if !SMBIOS_PROVIDED_BY_MOBO
        default "coreboot"
        help
          The BIOS_VENDOR string to store in the SMBIOS Type0 table.
```

There's already an SMBIOS section in src/Kconfig, so this fits there, inside the `if GENERATE_SMBIOS_TABLES` block