UPSTREAM: PCI: Unify ACPI and DT 'preserve config' support

Unify the 'preserve config' support across ACPI and device-tree
boot flows.

Link: https://lore.kernel.org/r/20240508174138.3630283-4-vidyas@nvidia.com


Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Bug: 449774562
Change-Id: Ic0a2397595ff07a8b7a121f332d6773b429d91a8
Signed-off-by: Jian-Min Liu <jianminl@nvidia.com>
(cherry picked from commit 1e692248)
(cherry picked from commit 5a13b8c5)