bcdUSB has been previously updated from 1.1 to 2.0 in default
device descriptor, but not in DFU class. After USB bus reset
performed by dfu-util, alternative descriptor is registered
with bcdUSB set to 1.1. This mismatch causes communication failure.
DFU descriptor's bcdUSB has been updated to match default one.
Relates to #7570
Signed-off-by: Paweł Zadrożniak <pawel.zadrozniak@nordicsemi.no>
f3d1b22487