[media] s5p-cec: fix system and runtime PM integration

Use generic helpers instead of open-coding usage of runtime PM for system
sleep PM, which was potentially broken for some corner cases.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/s5p-cec/s5p_cec.c

@@ -250,22 +250,9 @@ static int s5p_cec_runtime_resume(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused s5p_cec_suspend(struct device *dev)
-{
-	if (pm_runtime_suspended(dev))
-		return 0;
-	return s5p_cec_runtime_suspend(dev);
-}
-
-static int __maybe_unused s5p_cec_resume(struct device *dev)
-{
-	if (pm_runtime_suspended(dev))
-		return 0;
-	return s5p_cec_runtime_resume(dev);
-}
-
 static const struct dev_pm_ops s5p_cec_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(s5p_cec_suspend, s5p_cec_resume)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
 	SET_RUNTIME_PM_OPS(s5p_cec_runtime_suspend, s5p_cec_runtime_resume,
 			   NULL)
 };