Since modern HDMI cards often have more than one output pin and thus
input device, we need to know which one has actually been plugged in.

This patch adds a name hint that indicates which PCM device is connected 
to which pin.

To do that, the jack creation has been deferred to build_controls, i e, 
after the PCM devices have been created.

Would be great to have Stephen look through this patch quickly before 
it's committed.

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic