[Jaunty Netbook] Fix for rear audio port on Conexant 5051 codec

[Stefan Bader]

Michael Frey wrote:
> Please apply the attached patch to the jaunty-netbook branch.
> 
> Fix for Conexant 5051 codec.  Allow use of rear audio port.
> 
> BugLink: https://bugs.edge.launchpad.net/walpole-anakin/+bug/394960
> 
> 
> Michael
> 
> 
This one looks a bit more at risk than the microphone one, as it also changes 
portions of the code. But as it goes to the netbook branch I assume testing has 
  decent coverage. But it should also describe how it came in. ACK with that

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