[S] Change in coreboot[master]: checkpatch: add Co-authored-by to signature list

[Angel Pons (Code Review)]

Attention is currently required from: Felix Singer, Patrick Georgi, Martin L Roth, Paul Menzel, Tim Wawrzynczak, Michael Niewöhner.

Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/69166 )

Change subject: checkpatch: add Co-authored-by to signature list
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Patch Set 1: Code-Review+1

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/69166/comment/846c37a9_46a0f325 
PS1, Line 10: author. Add it to the list to make Jenkins happy.
What's the difference between simply having multiple sign-offs?

File util/lint/checkpatch.pl:

https://review.coreboot.org/c/coreboot/+/69166/comment/690573d1_d2aad25e 
PS1, Line 618: 	Reviewed-by:|
> Unrecognized email address: '|'

why is checkpatch self-deprecating itself