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

[Alexey Buyanov (Code Review)]

Attention is currently required from: Nico Huber, Marshall Dawson, Paul Menzel, Julius Werner, Nikolai Vyssotski, Felix Held.
Hello build bot (Jenkins), Marshall Dawson, Julius Werner, Nikolai Vyssotski, Felix Held,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/61311

to look at the new patch set (#5).

Change subject: console: Add IO port serial logging
......................................................................

console: Add IO port serial logging

IO ports can be used for debug data output as an alternative for
UART. Protocols used to output this data can vary. The patch ports a
custom version of such a protocol to coreboot debug log printing
routines.

Use cases may include UART problems bypassing or using of systems
without UART.

TEST=received data through port 80 and parsed it, the log is exactly
the same as UART logs

Signed-off-by: Alexey Buyanov 
Change-Id: I87afea28535e03ef39e104e353255a901015973b
---
M src/arch/x86/include/arch/io.h
M src/arch/x86/post.c
M src/console/Kconfig
M src/console/console.c
M src/console/post.c
M src/include/console/console.h
A src/include/console/io_port.h
M src/soc/amd/sabrina/bootblock.c
8 files changed, 56 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/11/61311/5