[S] Change in coreboot[main]: mb/lenovo/*: Set VR12 PSI to fix crash

[Angel Pons (Code Review)]

Attention is currently required from: Alexander Couzens, Felix Held, Patrick Rudolph.

Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/82070?usp=email )

Change subject: mb/lenovo/*: Set VR12 PSI to fix crash
......................................................................

Patch Set 1: Code-Review+1

(4 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/82070/comment/a36d2a8b_7998b666 :
PS1, Line 13: as the vendor BIOS does to fix a hang when the package is idle.
IIRC from CB:81597 review, you want boards to always specify these values. If so, then you should highly consider extending `util/autoport` to automatically read the relevant registers and write the values into the devicetree.

https://review.coreboot.org/c/coreboot/+/82070/comment/39b2843c_e6f2e9d0 :
PS1, Line 14:
> `Possible unwrapped commit description (prefer a maximum 72 chars per line)`

Please fix.

https://review.coreboot.org/c/coreboot/+/82070/comment/a381ffea_a54b873b :
PS1, Line 19: The X220 already has the correct PSI values configured and is now stable
Was this change tested on the other boards?

File src/mainboard/lenovo/l520/devicetree.cb:

https://review.coreboot.org/c/coreboot/+/82070/comment/f5075e8d_2e4d679d :
PS1, Line 17: register "pp0_psi[VR12_PSI2]" = "{VR12_ALL_PHASES, 5}"
            : 		register "pp0_psi[VR12_PSI3]" = "{VR12_ALL_PHASES, 1}"
            : 		register "pp1_psi[VR12_PSI2]" = "{VR12_ALL_PHASES, 5}"
            : 		register "pp1_psi[VR12_PSI3]" = "{VR12_ALL_PHASES, 1}"
If I get bored I will refactor this to use a 2D array:

```
register "pp_psi" = "{
    [0] = {
    	[VR12_PSI2] = {VR12_ALL_PHASES, 5},
    	[VR12_PSI3] = {VR12_ALL_PHASES, 1},
    },
    [1] = {
    	[VR12_PSI2] = {VR12_ALL_PHASES, 5},
    	[VR12_PSI3] = {VR12_ALL_PHASES, 1},
    },
}"
```