We only support 4 total chain entries at the moment, but that can be
"easily expanded"... We don't really have a lite dynamic vector, just
the big fat dynamic lists, so improving on this needs some extra effort.
This commit also drags in a bunch of random network work by necessity.
This doesn't include a userland interface, but it does include a couple
of commands for the debug shell. ac97_status, which shows some register
and port values for the ac97 and ac97_noise which attempts to play a
(very annoying) 440Hz sine wave through the sound card.
