Add initial implementation for booting on QEMU POWER9 emulation. Change-Id: I079c5b9ad564024dd13296ef75c263bdc40c9d39 Signed-off-by: Yaroslav Kurlaev <yaroslav.kurlaev@3mdeb.com> Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/57079 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>