The S3 and S4 events are now handled the same way internally, there is no
need to keep separate wrapper functions around them. Simply reuse the
suspend/resume versions everywhere.

No functional change.
Signed-off-by: NImre Deak <imre.deak@intel.com>
Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>