PPP in convergence: No sound thrue HDMI over PBP dock
### Describe your issue
When PPP EE connected to PBPDock no hdmi sound interface are detected. (only the jack sound interface)
#### Expected Behavior
plugin HDMI TV then play videos result in image and sound shared thrue the HDMI port.
#### Observed Behavior
no HDMI sound interface detected
### How reproducible is the bug?
Always
### Steps to reproduce the bug
1. plugin HDMI TV
2. play movie
3. watch and ~~hear~~ the movie
### What device are you using?
PPP EE
Linux phone 5.19-rockchip SMP PREEMPT_DYNAMIC Sun Aug 14 01:52:45 UTC 2022 aarch64 GNU/Linux Distributor ID: Debian Description: Debian GNU/Linux bookworm/sid Release: testing Codename: bookworm
### Which mobian repository are you using?
deb https://repo.mobian.org/ staging main non-free
### How did you get your Mobian Image?
* calamares installer
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