audiohda: allow manual pin routing, more verbose audiostat, initial mute of al widgets

the automatic routing from jack to dac/adc sometimes gets us
a path thats not audible. manually specifying a route path
gets us arround these. the syntax is just a comma separated
list of node ids in the "pin" and "inpin" audioctl commands
instead of a single pin node id.

to find alternative paths, audiostat now lists all the widgets;
not just the pins; and ther input connections.

initially mute all pins and amps of all function groups.
connectpath() and disconnectpath() will mute and unmute
the widgets as required later.

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