Rigo-V

For compatibility with an udev rules like: `DRIVERS=="cdc_acm", ATTRS{interface}=="serprog", SYMLINK+="serprog%n"` With an stm32-vserprog and a [pico-serprog](https://codeberg.org/Riku_V/pico-serprog) board plugged in, I automatically get: /dev/serprog0 (->/dev/ttyACM0) /dev/serprog1 (->/dev/ttyACM1)

Test setup: Nucleo-F042K6 wired to an EN25F80 (1024kB) on a breadboard. RESET/HOLD and WP pulled to VCC. flashrom -p serprog:dev=/dev/serprog1,spispeed=36M -w rand 8,49s user 1,00s system 47% cpu 20,069 total...