drm: kirin: Remove useless "Scale not support" error message

The driver doesn't support scaling, but when an atomic test is done
it repeatedly spits out this warning which isn't particularly useful.

So just remove the error message.

Cc: Xinliang Liu <z.liuxinliang@hisilicon.com>
Cc: Rongrong Zou <zourongrong@gmail.com>
Cc: Xinwei Kong <kong.kongxinwei@hisilicon.com>
Cc: Chen Feng <puck.chen@hisilicon.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Peter Griffin <peter.griffin@linaro.org>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1529622076-20386-1-git-send-email-john.stultz@linaro.org

drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c

@@ -859,7 +859,6 @@ static int ade_plane_atomic_check(struct drm_plane *plane,
 		return PTR_ERR(crtc_state);
 
 	if (src_w != crtc_w || src_h != crtc_h) {
-		DRM_ERROR("Scale not support!!!\n");
 		return -EINVAL;
 	}