[coreboot-gerrit] Change in coreboot[master]: arch/x86/smbios: Bump to 3.1

[Marcello Sylvester Bauer (Code Review)]

Marcello Sylvester Bauer has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/44013 )

Change subject: arch/x86/smbios: Bump to 3.1
......................................................................

Patch Set 2: Code-Review+1

diff `dmidecode -t 17` HEAD~ HEAD on a ThinkPad X220:
```
3c3
< SMBIOS 3.0 present.
---
> SMBIOS 3.1 present.

18c18
<       Speed: 533 MT/s
---
>   Speed: 1066 MT/s

24c24
<       Configured Memory Speed: 533 MT/s
---
>   Configured Memory Speed: 1066 MT/s

42c42
<       Speed: 533 MT/s
---
>   Speed: 1066 MT/s

48c48
<       Configured Memory Speed: 533 MT/s
---
>   Configured Memory Speed: 1066 MT/s

```