PM / devfreq: rk3399_dmc: Remove explictly regulator_put call in .remove

Current code uses devm_regulator_get() in .probe so a regulator_put() will
be automatically called when unload the module. Remove the explictly
regulator_put() call and then we can also remove rk3399_dmcfreq_remove().

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/devfreq/rk3399_dmc.c

@@ -450,23 +450,13 @@ static int rk3399_dmcfreq_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static int rk3399_dmcfreq_remove(struct platform_device *pdev)
-{
-	struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev);
-
-	regulator_put(dmcfreq->vdd_center);
-
-	return 0;
-}
-
 static const struct of_device_id rk3399dmc_devfreq_of_match[] = {
 	{ .compatible = "rockchip,rk3399-dmc" },
 	{ },
 };
 
 static struct platform_driver rk3399_dmcfreq_driver = {
 	.probe	= rk3399_dmcfreq_probe,
-	.remove	= rk3399_dmcfreq_remove,
 	.driver = {
 		.name	= "rk3399-dmc-freq",
 		.pm	= &rk3399_dmcfreq_pm,