[XS] Change in coreboot[master]: smm: Invalid the smm handler region instead of the whole

[Bao Zheng (Code Review)]

Attention is currently required from: Arthur Heymans, Felix Held, Fred Reitberger, Jason Glenesk, Matt DeVillier, Raul Rangel, Zheng Bao.

Bao Zheng has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/69783?usp=email )

Change subject: smm: Invalid the smm handler region instead of the whole
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Patch Set 5:

(1 comment)

File src/soc/amd/common/block/cpu/smm/smm_relocate.c:

https://review.coreboot.org/c/coreboot/+/69783/comment/86eb70fe_4cdee859 :
PS4, Line 85: tseg_valid();
            : 	lock_smm();
> > https://review.coreboot.org/c/coreboot/+/64871/comments/42ed8bbb_f4efd5eb […]

changed. 
It should be changed all the time instead of resumming.