media: amphion: Remove dummy PM handling

Since commit 63d00be69348fda4 ("PM: runtime: Allow unassigned
->runtime_suspend|resume callbacks"), unassigned
.runtime_{suspend,resume}() callbacks are treated the same as dummy
callbacks that just return zero.
Unassigned system sleep callbacks were always treated the same as dummy
callbacks that just return zero.

As the driver has no other PM callbacks than dummy callbacks, all PM
handling can be removed.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Ming Qian <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/platform/amphion/vpu_drv.c

···
 	mutex_destroy(&vpu->lock);
 }
 
-static int __maybe_unused vpu_runtime_resume(struct device *dev)
-{
-	return 0;
-}
-
-static int __maybe_unused vpu_runtime_suspend(struct device *dev)
-{
-	return 0;
-}
-
-static int __maybe_unused vpu_resume(struct device *dev)
-{
-	return 0;
-}
-
-static int __maybe_unused vpu_suspend(struct device *dev)
-{
-	return 0;
-}
-
-static const struct dev_pm_ops vpu_pm_ops = {
-	SET_RUNTIME_PM_OPS(vpu_runtime_suspend, vpu_runtime_resume, NULL)
-	SET_SYSTEM_SLEEP_PM_OPS(vpu_suspend, vpu_resume)
-};
-
 static struct vpu_resources imx8qxp_res = {
 	.plat_type = IMX8QXP,
 	.mreg_base = 0x40000000,
···
 	.driver = {
 		.name = "amphion-vpu",
 		.of_match_table = vpu_dt_match,
-		.pm = &vpu_pm_ops,
 	},
 };