DJI O3 OSD support

[TruAero]

Describe problem solved by the proposed feature

Currently there is no way to give airspeed, attitude, and home point info the DJI o3 air unit over telemetry natively in PX4. The current work around is to install a secondary flight controller and peripherals which supports the DJI o3's OSD.

Describe your preferred solution

The preferred solution is to simply enable a parameter/driver or enable a telemetry port which communicates to the DJI O3 the flight information.

Describe possible alternatives

N/A

Additional context

It looks like there has already been discussion on this issue here: https://discuss.px4.io/t/msp-osd-support-for-walksnail-vtx-and-avatar-goggles/40134/18