The split of bootblock initialisation to cpu, northbridge and
southbridge is not specific to intel at all, create new header
<arch/bootblock.h> as AMD will want some of these too.
Change-Id: I702cc6bad4afee4f61acf58b9155608b28eb417e
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37429
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>