Taking photos with the back camera on the Librem 5 does not work on postmarketOS

In postmarketOS, taking photos with the back camera on the Librem 5 does not work. The viewfinder works and gives you a view of what the camera sees, but once you hit the button to take a photo the viewfinder hangs and the photo processing spinner spins indefinitely. This is with Millipixels 0.20.0 and Linux 6.1.10, but it can also be reproduced with our build of Linux 6.1.8. Notably, the front camera works fine. Unlike linux#458 (closed), this can be reproduced right away after a reboot.

Downstream issue: https://gitlab.com/postmarketOS/pmaports/-/issues/1947