kvm: Pass PCI device pointer to MSI routing functions

kvm: Pass PCI device pointer to MSI routing functions

In-kernel ITS emulation on ARM64 will require to supply requester IDs.
These IDs can now be retrieved from the device pointer using new
pci_requester_id() function.

This patch adds pci_dev pointer to KVM GSI routing functions and makes
callers passing it.

x86 architecture does not use requester IDs, but hw/i386/kvm/pci-assign.c
also made passing PCI device pointer instead of NULL for consistency with
the rest of the code.

Signed-off-by: Pavel Fedin <[email protected]>
Message-Id: <ce081423ba2394a4efc30f30708fca07656bc500.1444916432[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>