most kernel developers will respond to private e-mails about new developments.
there isn't a list for this, in part because there are so many kernel developers that such a list would hardly be limited.
the kernel folks have included drivers for hardware that's not shipping yet.
so, the kernel developers have shown that they are willing to work with embedded developers, but they can't be proactive about it because they don't have any way of knowing that they need to contact someone. the embedded developers know they are working on something, and can easily find out who to contact for advice. for the most part they don't choose to do so.