USB audio patch

[Hans Petter Selasky]

Hi,

If you have a USB audio device which uses the feedback endpoint, where 
the sample rate is not locked to the USB, you may want to try the 
attached patch. I will test it a bit more and then it will hit the tree 
next week.

The basic of the change is to reduce the number of sample rate 
adjustments. Some devices only update the sample rate very slowly, and 
the current USB audio driver is polling very fast, so the algorithm 
simply becomes unreliable with some kinds of USB audio devices.

--HPS
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