Change in coreboot[master]: console: Add ANSI escape sequences for highlighting

[Raul Rangel (Code Review)]

Attention is currently required from: Nico Huber, Patrick Georgi, Julius Werner, Kyösti Mälkki.
Raul Rangel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/61307 )

Change subject: console: Add ANSI escape sequences for highlighting
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Patch Set 3:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/61307/comment/09655650_b55e94e5 
PS3, Line 17: minicom
picocom FTW!

File src/commonlib/include/commonlib/loglevel.h:

https://review.coreboot.org/c/coreboot/+/61307/comment/56505c39_b1f8dc01 
PS3, Line 190: BIOS_LOG_ESCAPE_PATTERN
Looks like this isn't used.

If we did this in printk.c we could use `vtxprintf(wrap_putchar, BIOS_LOG_ESCAPE_PATTERN, args, NULL);`