During r9 hardware development it was thought that the MAX2839 would use
a different GPIO pin for chip select, but it ended up being the same pin
as is used for MAX2837 on other hardware revisions.
This takes the MAX283x abstraction a bit further and fixes a bug with
hackrf_debug -m.
Just a very rough merge to get off the ground. Major parts are not yet
implemented. The mixer intergration is in a messed up state. Part which
need work have been marked with XXX
Conflicts:
firmware/common/hackrf_core.c
firmware/common/hackrf_core.h
firmware/common/max2837.c
firmware/common/max2837.h
firmware/common/rf_path.c
firmware/common/rffc5071.c
firmware/common/rffc5071.h
firmware/common/sgpio.c
firmware/common/si5351c.c
firmware/common/tuning.c
firmware/common/w25q80bv.c
firmware/common/w25q80bv.h
firmware/common/xapp058/ports.c
firmware/hackrf-common.cmake
firmware/hackrf_usb/hackrf_usb.c
firmware/hackrf_usb/usb_api_register.c
firmware/hackrf_usb/usb_api_transceiver.c
host/hackrf-tools/src/hackrf_transfer.c
