Fix discovery of device, subsystem_vendor and subsystem_device

[gauravkghildiyal]

We're looking for these files in the wrong location:

dranet/pkg/inventory/sysfs.go

Lines 185 to 191 in dfd866c

	device, err = os.ReadFile(filepath.Join(sysdevPath, ifName, "device/device"))
	if err == nil {
	subsystemVendor, err = os.ReadFile(filepath.Join(sysdevPath, ifName, "device/subsystem_vendor"))
	if err == nil {
	subsystemDevice, _ = os.ReadFile(filepath.Join(sysdevPath, ifName, "device/subsystem_device"))
	}
	}

These files are located as /sys/class/net/<INTERFACE_NAME>/device/ and not at /sys/devices/<INTERFACE_NAME>/device

Also, it appears that correctly deriving these values causes some downstream issues where we fail to fetch the device from pcidb:

dranet/pkg/inventory/sysfs.go

Lines 194 to 199 in dfd866c

	entry, err := pcidb.GetDevice(
	strings.TrimPrefix(strings.TrimSpace(string(vendor)), "0x"),
	strings.TrimPrefix(strings.TrimSpace(string(device)), "0x"),
	strings.TrimPrefix(strings.TrimSpace(string(subsystemVendor)), "0x"),
	strings.TrimPrefix(strings.TrimSpace(string(subsystemDevice)), "0x"),
	)