WIP: temp/modemmanager: use subpackages for plugins
- Creates subpackages for the ModemManager plugins we use in pmOS
- We can install the necessary plugin per device now, reducing the number of plugins ModemManager has to try for a modem when resuming.
- All other plugins are disabled, device maintainers can add their plugin if needed.
Enabled plugins
- Quectel: PinePhone EG25 modem
- Broadmobi: Librem 5 broadmobi variant
- Cinterion: Librem 5 cinterion variant