[coreboot-gerrit] Change in coreboot[master]: console: Add IO port serial logging

[Paul Menzel (Code Review)]

Attention is currently required from: Alexey Buyanov, Jason Glenesk, Raul Rangel, Nico Huber, Marshall Dawson, Julius Werner, Nikolai Vyssotski, Fred Reitberger, Felix Held.
Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/61311 )

Change subject: console: Add IO port serial logging
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Patch Set 5:

(2 comments)

Patchset:

PS5: 
Very nice. Please change the mainboard code in a separate commit.

File src/console/Kconfig:

https://review.coreboot.org/c/coreboot/+/61311/comment/b4a736ee_1b8ebfd7 
PS5, Line 489: config CONSOLE_AMD_IO_PORT
Why is that AMD specific? (If so, it needs to be clarified in the commit message.)