PCI/VMD: Configure MPS settings before adding devices

In order to provide the most performance and/or compatible settings,
ensure VMD root buses observe the pcie bus tuning settings by
configuring those settings prior to adding the devices to the pcie tree.

This patch open-codes pci_rescan_bus() and configures the buses prior to
adding devices and attaching drivers.

Signed-off-by: Jon Derrick <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Reviewed-by: Keith Busch <[email protected]>

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