[M] Change in coreboot[master]: mb/raptor-cs/talos-2: add basic mainboard structure

[Krystian Hebel (Code Review)]

Attention is currently required from: Michał Żygowski, Sergii Dmytruk, ron minnich.

Krystian Hebel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/67063 )

Change subject: mb/raptor-cs/talos-2: add basic mainboard structure
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Patch Set 5:

(1 comment)

File src/mainboard/raptor-cs/talos-2/bootblock.c:

https://review.coreboot.org/c/coreboot/+/67063/comment/5724ad24_525da64d 
PS5, Line 56: 	aspeed_early_config(serial_dev, vuart_init, ARRAY_SIZE(vuart_init));
I think we should skip this file altogether. Based on https://github.com/open-power/docs/issues/25 UART is already properly set up by BMC.