KnCMiner driver generation 2

Note: Requires generation 2 code in the FPGA controller.
Missing closing zero in api string
Change priority of some log messages
KnC: cleanup statistics a bit
KnC: Update ASIC library to current version
KnC: Framework for async SPI messages
Update knc-asic library to current version
Correct SPI buffer management
Update to newer knc-asic version with knc_decode_response()
knc_transfer() for transferring requests using async SPI
Switch to async SPI transfer model
KnC: Limit SPI transfers to 4KB. Beaglebone SPI kernel driver doesn't handle bigger transfers
KnC: Use consistent naming on the transfer functions
KnC: Correctly associate reports with their originating core
Prepare for pending slot during setstate
Update knc-asic to current version adding knc_decode_report
KnC: Use knc_decode_response() to make response processing more readable
Do initial detection of bflsc28 devices
Don't mistake bflsc28 for fpga
KnC: Catch communication errors again, blocking cores which repeatedly fails communication