dfu: Support devices with truncated DFU interface data
dfu: Support devices with truncated DFU interface data

We can assume they support DFU 1.1. Fixes flashing the Jabra Speak 410.

fwupd/fwupd,hughsie/fwupd,superm1/fwupd,hughsie/fwupd,hughsie/fwupd,vathpela/fwupd,vathpela/fwupd,fwupd/fwupd,hughsie/fwupd,vathpela/fwupd,vathpela/fwupd,fwupd/fwupd,superm1/fwupd,superm1/fwupd,fwupd/fwupd