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

[Arthur Heymans (Code Review)]

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

Arthur Heymans 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 4:

(1 comment)

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

https://review.coreboot.org/c/coreboot/+/69783/comment/543b0923_935af8a1 :
PS4, Line 85: tseg_valid();
            : 	lock_smm();
Maybe you want to move this later in the bootprocess?