trivial: fu-device: Downgrade warnings about overwiting same name to debug
trivial: fu-device: Downgrade warnings about overwiting same name to debug

Commit 0f72ef2f887 causes probe to be re-run on FuDevices.
Any devices derived from FuUsbDevice that set the "Name" key will have the
quirks re-evaluated when GUIDs are added again leading to warnings like this:

```
(fwupdtool:8259): Fu-WARNING **: 23:04:43.144: device 970e85c8400ed95ec5c02b86e52a0ca4ce6fc051 overwriting same name value: Dell USB hub
```

hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,vathpela/fwupd,vathpela/fwupd,fwupd/fwupd,vathpela/fwupd,vathpela/fwupd,fwupd/fwupd