[WIP] boards: arkv6x add cyphal build

[AlexKlimaj]

It looks like we'll need to plumb the H7 CAN driver for cyphal.

l.dir/CanardHandle.cpp.obj.d -o src/drivers/cyphal/CMakeFiles/drivers__cyphal.dir/CanardHandle.cpp.obj -c /home/alex/PX4-Autopilot/src/drivers/cyphal/CanardHandle.cpp
/home/alex/PX4-Autopilot/src/drivers/cyphal/CanardHandle.cpp:52:4: error: #error "No CAN driver enabled for Cyphal build"
   52 | #  error "No CAN driver enabled for Cyphal build"
      |    ^~~~~
compilation terminated due to -Wfatal-errors.
[493/1113] Building CXX object src/modules/control_allocator/CMakeFiles/modules__control_allocator.dir/ControlAllocator.cpp.obj
ninja: build stopped: subcommand failed.
make: *** [Makefile:227: ark_fmu-v6x_cyphal] Error 1