add sriov, power state and numa node info in PciDevice

[jj-asama]

I found these important for the observability tool I am building. Once this is merged, I will be adding these to the p8s collector as well.
Test case added from a Intel E810 NIC.

	NumaNode        *int32 // /sys/bus/pci/devices/<Location>/numa_node

	SriovDriversAutoprobe *bool   // /sys/bus/pci/devices/<Location>/sriov_drivers_autoprobe
	SriovNumvfs           *uint32 // /sys/bus/pci/devices/<Location>/sriov_numvfs
	SriovOffset           *uint32 // /sys/bus/pci/devices/<Location>/sriov_offset
	SriovStride           *uint32 // /sys/bus/pci/devices/<Location>/sriov_stride
	SriovTotalvfs         *uint32 // /sys/bus/pci/devices/<Location>/sriov_totalvfs
	SriovVfDevice         *uint32 // /sys/bus/pci/devices/<Location>/sriov_vf_device
	SriovVfTotalMsix      *uint64 // /sys/bus/pci/devices/<Location>/sriov_vf_total_msix

	D3coldAllowed *bool          // /sys/bus/pci/devices/<Location>/d3cold_allowed
	PowerState    *PciPowerState // /sys/bus/pci/devices/<Location>/power_state

I am not really interested in Offset, Stride VfDevice and MSI-X. Just added for completeness. Please let me know if I should rather remove them.

@discordianfish for your kind review.

ref: https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-bus-pci