drm/atmel-hlcdc: Compile suspend/resume for PM_SLEEP only
If PM is enabled but PM_SLEEP is disabled, the suspend/resume functions are still unused and produce a compiler warning. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Cc: <stable@vger.kernel.org> # 4.1+
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