Add compatibility for HackRF One

[muellermartin]

I'd really like to see support for open hardware SDRs like the HackRF One (or the LimeSDR projects).

As far as I know, the HackRF One uses a CPLD instead of a FPGA. Unfortunaletely, I've no experience with FPGAs or alike therefore I would like know whether porting openwifi to the HackRF One is possible and what steps might be required for the port.

Some information about the HackRF One:

• hardware specifications: https://github.com/mossmann/hackrf/wiki/HackRF-One CPLD
• hardware components: https://github.com/mossmann/hackrf/wiki/Hardware-Components
• CPLD firmware: https://github.com/mossmann/hackrf/tree/master/firmware/cpld

I'd be happy to help with whatever I can (e.g. testing).

[JiaoXianjun]

Current openwifi fpga design is not highly optimized and needs around 27K Xilinx Kintex-7 LUTs. Hackrf’s cpld performance and volume are far below the openwifi requirement.

[JiaoXianjun]

Now the smallest FPGA openwifi can run is Xilinx Zynq 7020 level.