[S] Change in coreboot[master]: util/lint/stable-017: Update full config pattern matching

[Arthur Heymans (Code Review)]

Attention is currently required from: Martin L Roth, Paul Menzel, Maximilian Brune.

Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74220 )

Change subject: util/lint/stable-017: Update full config pattern matching
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Patch Set 3:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/74220/comment/b6ef0a20_7162003c 
PS2, Line 9: CONFIG_ARCH gives false positives for CONFIG_USE_EXP_X86_64_SUPPORT so
           : use a different string: 'CONFIG_MAINBOARD_DIR'.
> I don't understand. How does CONFIG_USE_EXP_X86_64_SUPPORT influence the grep for CONFIG_ARCH_? I only see that CONFIG_USE_EXP_X86_64_SUPPORT selects ARCH_ALL_STAGES_X86_64. 
> ARCH_ALL_STAGES_X86_64 is not a configurable option, so that is apparently also not the issue.
> I tried it out and there also seems to be no problem with the current configs directory.

Sorry wrong config option. Fixed