[coreboot-gerrit] Change in coreboot[master]: src/cpu/power9: add file structure for power9, implement SCOM access

[Sergii Dmytruk (Code Review)]

Attention is currently required from:  Felix Singer, Krystian Hebel, Timothy Pearson, Ron Minnich.
Sergii Dmytruk has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/57078 )

Change subject: src/cpu/power9: add file structure for power9, implement SCOM access
......................................................................

Patch Set 11:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/57078/comment/e83356ad_16d26345 
PS10, Line 7: /*
> not needed here. please remove that.

Done

Patchset:

PS11: 
Removed `/*` from message of one commit.