Some SOC add PCI root busses structs at runtime without adding a
device struct to the bus because pci_scan_bus does it. An example
would be xeon_sp which has multiple root busses.
TEST: ocp/deltalake boots again.
Change-Id: I81d9c94652e34dbf9e8cec64fc34ef0042563037
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60876
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
db199cc073