Adds board support for the ARK FPV.
https://arkelectron.com/product/ark-fpv-flight-controller/

Testing Checklist

From https://ardupilot.org/dev/docs/porting.html

• the board boots and connects to a GCS via USB (Mission Planner, QGC, MAVProxy,etc.)

• the GPS and Compass is recognized.

• the RC is recognized and RC input follows the TX

• the pitch and roll reports (ie HUD horizon) follows autopilot movement correctly (ie IMU is oriented properly and working). test each IMU individually using the INSx_USE parameters.

• the board arms with default arming checks (may need to force arm if GPS is indoors)

• attach a battery either directly if onboard power sensors or via external power module and make sure voltage is correctly displayed and current indication present

• attach a test servo to each output after setting the output to a normal function like elevator, and exercise each one with TX while in MANUAL mode to check output functionality. Bdshot capable outputs should be tested with a BLHeli32 esc for passthrough mode communication (non-IOMCU outputs).

• move the GPS to each UART output after setting all other UART protocols to NONE and the tested UART to GPS to assure the UART is functioning.

• UARTs with CTS/RTS lines should use a telemetry radio with those connected to be sure they function with BRD_SERx__CTSRTS=1

Questions

• How do I configure the ADC for the 12V input?
  

Requires

IIS2MDC compass driver PR
#28602