Vendor-specific airframes (Holybro, UVify, ATL, COEX, Bitcraze,
ThunderFly, Applied Aeronautics) are not relevant on the ARK FMU
boards and only consume flash. Add an rc.board_airframes whitelist
to ark_fmu-v6x and ark_fmu-v6s that keeps only the generic
multirotor, fixed-wing, VTOL, and rover frame types.
Flash savings (default variant):
ark_fmu-v6x: 1965708 -> 1957772 B (-7936 B, free 372 -> 8308 B)
ark_fmu-v6s: 1960212 -> 1945748 B (-14464 B, free 8108 -> 22572 B)
Signed-off-by: Jacob Dahl <dahl.jakejacob@gmail.com>
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