[Feature] Two different modes of OSD working simultaneously

## Feature request

Two different modes of OSD working simultaneously

Details: https://discuss.ardupilot.org/t/is-it-possible-for-two-osd-resolution-working-at-the-same-time/125505

**Platform**
[ ] All
[ ] AntennaTracker
[x] Copter
[ ] Plane
[ ] Rover
[ ] Submarine

**Additional context**
Copter 4.5.6 Analog+ MSP Display port

```
25/1/23 17:35:56 : ChibiOS: 6a85082c
25/1/23 17:35:56 : ArduCopter V4.5.6 (b867abc8)
25/1/23 17:35:56 : Frame: QUAD/X_REV
25/1/23 17:35:56 : RCOut: DS600:1-4 PWM:5-13
25/1/23 17:35:56 : Aocoda-RC-H743Dual 00290029 30315119
```

Start by reading the linked ArduPilot discussion and reproducing the report on Copter 4.5.6 with Analog and MSP Display output. No source file or test is named in the issue, so identify the OSD mode handling entry point and establish the expected behavior for both modes operating simultaneously. Done means the two requested OSD modes work at the same time on the reported setup.

Written by the indexing model from the issue text.