[PATCH v2 2/3] x86/quirks: Reintroduce scanning of secondary buses

We used to scan secondary buses until commit 8659c406ade3 ("x86: only scan the root bus in early PCI quirks") constrained early quirks to the root bus only. Its motivation was to prevent application of the nvidia_bugs quirk on secondary buses. We're about to add a quirk to reset the Broadcom 4331

[PATCH v2 2/3] x86/quirks: Reintroduce scanning of secondary buses

We used to scan secondary buses until commit 8659c406ade3 ("x86: only scan the root bus in early PCI quirks") constrained early quirks to the root bus only. Its motivation was to prevent application of the nvidia_bugs quirk on secondary buses. We're about to add a quirk to reset the Broadcom 4331