dfu: Add some trivial, but useful, debugging for AVR DFU devices
dfu: Add some trivial, but useful, debugging for AVR DFU devices

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