postmarketOS voice call on PinePhone

I quickly shot this video at the end of the day and in a bit of a rush, so didn't explain a few things of significance: 1) At the time of publishing, and to the best of my knowledge, this only works on the newest postmarketOS image. 2) This is still very much WIP 3) This does require a little bit of setup (selecting make a phone call under sound settings)