[M] Change in coreboot[main]: soc/ibm/power9/*: add file structure for SOC

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Felix Held, Felix Singer, Igor Bagnucki, Krystian Hebel, Maciej Pijanowski, Martin L Roth, Michał Kopeć, Michał Żygowski, Paul Menzel.

Sergii Dmytruk has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/67062?usp=email )

Change subject: soc/ibm/power9/*: add file structure for SOC
......................................................................

Patch Set 33:

(2 comments)

File src/soc/ibm/Kconfig:

PS32:
> Add missing license header

Dropped the file instead, turns out it's not needed anymore.

File src/soc/ibm/power9/Kconfig:

PS32:
> Add missing SPDX header

Done