Change in coreboot[master]: soc/amd/picasso: implement and use mca_is_valid_bank

[Felix Held (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Marshall Dawson.
Felix Held has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56275 )

Change subject: soc/amd/picasso: implement and use mca_is_valid_bank
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Patch Set 1:

(1 comment)

File src/soc/amd/picasso/mca.c:

https://review.coreboot.org/c/coreboot/+/56275/comment/bbb7c42f_117d5a32 
PS1, Line 142: ""
> Does that mean this should be NULL instead?

all MSRs we want to access exist for this bank, so no need to do this. setting it to NULL is basically only to work around the problem on stoneyridge where we'd be getting general protection faults. so it's still a valid MCAX bank; it just won't do anything if i read the docs correctly