[pwc] Preserve user setting for another program

[Mathieu Bouchard]

On Fri, 14 Dec 2007, Ben Lau wrote:

> In fact , only the setting of AGC is not preserved. By looking through
> the source code , I found that AGC is set to auto mode inside the
> pwc_video_open. Therefore , no matter what value you have picked
> inside camstream, it will restore to auto mode automatically.
>
> Becoz I need this feature for a demonstration urgently, I have fixed
> it by myself. The patch is attached in my email.
>
> (Based on the source code come with 2.6.20.6 kernel)

ah sorry for duplicating the solution, I didn't see this mail.

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