Draft: card: notify audio HAL about headphone/headset connection state

This fixes wired headphone/headset audio playback on Volla X23. I'm not sure myself if droid-extcon/droid-extevdev are the right place to do it, as it won't apply on SailfishOS, so please provide feedback if you think there is a better way. There seem to be code to translate droid.parameter.* to HAL parameters in droid-sink, but I didn't find a way to get the correct sink to set it on from extcon/extevdev.

Fixes ubports/porting/reference-device-ports/halium12/volla-x23/volla-vidofnir#7.