Change in coreboot[master]: device: Add a helper to find device behind a PCI-to-PCI bridge device

[9elements QA (Code Review)]

9elements QA has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/40474 )

Change subject: device: Add a helper to find device behind a PCI-to-PCI bridge device
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Patch Set 10:

Automatic boot test returned (PASS/FAIL/TOTAL): 4/0/4
Emulation targets:
"QEMU x86 q35/ich9" using payload TianoCore : SUCCESS : https://lava.9esec.io/r/2531
"QEMU x86 q35/ich9" using payload SeaBIOS : SUCCESS : https://lava.9esec.io/r/2530
"QEMU x86 i440fx/piix4" using payload SeaBIOS : SUCCESS : https://lava.9esec.io/r/2529
"QEMU AArch64" using payload LinuxBoot_u-root_kexec : SUCCESS : https://lava.9esec.io/r/2528

Please note: This test is under development and might not be accurate at all!