Change in coreboot[master]: src/mainboard/emulation/qemu-power9: require hb-mode=on

[Arthur Heymans (Code Review)]

Attention is currently required from: Paul Menzel, Sergii Dmytruk, Timothy Pearson, Ron Minnich.
Arthur Heymans has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/57082 )

Change subject: src/mainboard/emulation/qemu-power9: require hb-mode=on
......................................................................

Patch Set 13:

(1 comment)

Patchset:

PS12:
> The conditional isn't there to remove unused symbols in ramstage, it's to take change in addressing into account. I've added a comment which should explain what's going on and resolve all of your comments.

I don't really understand why just setting ramstage to the required offset won't work and redefining a lot of unused symbols is needed. Early stages don't need to know the ramstage symbol either, so I don't understand why you even need CPP in here.