Spurious headphone detection interrupts

[dsimic]

If the PineBook Pro's analog switch IC works (i.e., misbehaves) similarly to the one in PinePhone, that would actually be the source of DC bias on the headphones jack.  Furthermore, that might actually be the reason why the headphones detection works at all, or at least why it works when there's no music playback.

I would really like to have a few other PineBook Pro owners to check the interrupt counts and post their results here.  If we confirm this as a hardware issue, we can add it to the wishlist for the next PineBook Pro revision.