Log Message:
hackrf: update to 2018.01.1

Please note that if you are on 2015 firmware you must update the SPI flash
and CPLD of your hackrf, otherwise you may experience unpredictable behavior.

See: https://github.com/mossmann/hackrf/wiki/Updating-Firmware

HackRF 2018.01.1
- improved reliability of DFU boot loader

HackRF 2017.02.1
- Sweep mode
- Hardware synchronization
- reduced power consumption
- bug fixes