AcerNotebook-ESS1688 support

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My AcerNotebook has an ESS1688-soundchip, but the linux driver doesn't recognize it. The reason for this is that the chips needs to be initialized by some 'magic' reads. I discovered this by looking at the DOS-driver, so I don't know WHY it works.

This patch was available as C-source for a module and was tested successfully on several different Acer-notebooks. This is now the kernel-patch version.

I eMailed the patch to the guy who did the sound system and he said that it is already in the commercial driver and that it will be in the free one next year (1998).