pci: store PCI_INTERRUPT_PIN in pci_dev

For surprise removal for pci hotplug, we need the value of the PCI_INTERRUPT_PIN for determining the correct interrupt to disable. These patches will store the pin value in the pci_dev structure, and then use it where appropriate.

Patches 1-3 are resends, with patch 4 being new. I just resent everything so that there's no confusion on what's the latest.

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