spitz: add gpio button support (fixes regression)

[Pavel Machek]

> > (Actually, I wonder how it could have ever worked: userspace should
> > certainly be in a loop there; kernel should not suspend machine on its
> > own. In -rp kernels, kernel _does_ suspend on its own, but... I'm not
> > sure if that's suitable for mainline).
> 
> At least userspace apmd should be able to enter into suspend process
> (tested in 2.6.26-RP, not yet verified in 2.6.32-rc*).
> 
> I don't know, what is the preferred way in recent days, but Tosa does
> the same.

Ok, lets do it that way, then. I guess you need to post patch with
your signed-off-by, and you can add my acked-by.
									Pavel
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