[coreboot-gerrit] Change in coreboot[master]: drivers/pc80/rtc: Make use of alt-century byte configurable

[Nico Huber (Code Review)]

Attention is currently required from: Angel Pons.
Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56214 )

Change subject: drivers/pc80/rtc: Make use of alt-century byte configurable
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Patch Set 2:

(1 comment)

File src/drivers/pc80/rtc/mc146818rtc.c:

https://review.coreboot.org/c/coreboot/+/56214/comment/665233d1_da38478c 
PS1, Line 235: 69
> Hrmm, copied from Linux ;)

Reworked. The calculation was wrong anyway (copied from Linux where 1900 AD is the
base, but coreboot's `year` is 0 AD based).