[pvmfw][virtio] Refactor PCI initialisation am: 287de62468

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2617394

Change-Id: Iefb8da88c636bc5ac7ddcc709d07e6d472ec2715
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>