ALI 5451 southbridge AC'97 audio integrated

I just integrated support for the ALi Southbridge AC'97 controller found on certain x86 motherboards The necessary driver (audiots from the SPARC world, actually) is available on x86 platforms starting with build 115. For the moment this driver only supports stereo, but if someone has a multichannel configuration that they want to have supported, they should contact me and I'll work with them to get the testing necessary to enable this done.

Enjoy.

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