[PATCH] drm/radeon: Include swiotlb.h if SWIOTLB configured.

[Huacai Chen]

When SWIOTLB is configured, if without this patch kernel compilation
fails with error messages:
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Do you means I need to copy the From line and paste it after the Subject line?

>
> [?]
>
>
> Thanks,
>
> Paul
>
>
> [1] http://lists.freedesktop.org/archives/dri-devel/2012-July/025200.html
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