feat: enable S.PORT telemetry by default for SBUS and PPM modules

[raphaelcoeffic]

Fixes #3877

Summary of changes:

• Enable S.PORT telemetry by default for SBUS and PPM modules.

[rotorman]

Tested with RadioMaster TX16S mkII running Yaapu Lua Telemetry widget. MavlinkToPassthrough connected to Dragonlink TX. On model side, flight controller running ArduPlane and talking native MAVLink.

Result - telemetry data, via S.PORT passthrough, works with Yaapu Lua telemetry widget.

Update: I did not test the outgoing direction, thus if S.BUS out works.

[rotorman]

Tested the S.BUS connectivity as well - also functions as it should - I see channel values in Mission Planner, connected at FC side, whereas DragonLink TX was connected via S.BUS.

[pfeerick]

Is something also needed for 2.10 / main ?

[raphaelcoeffic]

Is something also needed for 2.10 / main ?

I don't think so, we should solve this in a better way in main. See #3780. I don't really like enabling S.PORT implicitly like that, but it's ok for 2.9 until we provide a better solution in main.

[pfeerick]

Perfect... that one is up soon :)