uses the USB CDC ACM example code as template to create a USB DFU
description according to USB DFU specification version 1.1
USB DFU stack is under LGPLv2.1 or later license
Change-Id: I7bd6cb46b734ffe8a51f2de7083b4f9e76d385e6
this is the USB CDC Echo example project source code,
for the Microchip SAM E54 Xplained Pro development board,
based on the ATSAME54P20A micro-controller,
exported from the Atmel START website,
using the ASFv4 library.
Change-Id: Ic0e58e42d1a4076bc84a0a8d3509ec4b09a37f46