pci: Add INTx routing notifier
This per-device notifier shall be triggered by any interrupt router along the path of a device's legacy interrupt signal on routing changes. For simplicity reasons and as this is a slow path anyway, no further details on the routing changes are provided. Instead, the callback is expected to use pci_device_route_intx_to_irq to check the effect of the change. Will be used by KVM PCI device assignment and VFIO. Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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