In order to support selecting board based on serial number the iProduct
field needs to be inspected, with the hand-rolled parsing of the USB
descriptors this becomes cumbersome.

Furthermore the direct use of Linux's USBDEVFS creats an unnecessary
dependency on the host OS being Linux.

It's unclear why libusb wasn't choosen in the first place, perhaps it
relates to the faint memory of 0.1 vs 1.0 packaging issues?

Move to libusb-1.0 in order to resolve these issues, as well as clean up
the code a bit.

Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>