drm/exynos: Don't touch DPMS when updating overlay planes

DPMS settings should only be changed by a full modeset.
exynos_plane_update() should only care about updating the planes itself
and nothing else.
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_plane.c

@@ -190,7 +190,6 @@ exynos_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
 		return ret;
 
 	exynos_plane_commit(plane);
-	exynos_plane_dpms(plane, DRM_MODE_DPMS_ON);
 
 	return 0;
 }