Change in coreboot[master]: soc/amd: fully commonize clear_tvalid

[Marshall Dawson (Code Review)]

Attention is currently required from: Jason Glenesk, Martin Roth, Felix Held.
Marshall Dawson has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50466 )

Change subject: soc/amd: fully commonize clear_tvalid
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Patch Set 6: Code-Review+2

(1 comment)

File src/soc/amd/common/block/cpu/smm/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/50466/comment/c63ce7db_2bd4e538 
PS5, Line 5: romstage-y += smm_helper.c
           : postcar-y += smm_helper.c
> *many

It's stoneyridge/memmap.c that's breaking and the function is called from smm_region() which is needed at those earlier times.  I forget now why we explicitly clear tvalid, e.g. maybe we weren't guaranteed of it coming up clear.