drm/panfrost: Use drm_sched_job_add_syncobj_dependency()

As panfrost_copy_in_sync() performs the same steps as
drm_sched_job_add_syncobj_dependency(), replace the open-coded
implementation in Panfrost in order to simply use the DRM function.
Reviewed-by: Alyssa Rosenzweig <alyssa@collabora.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Maíra Canal <mairacanal@riseup.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20230209124447.467867-5-mcanal@igalia.com

drivers/gpu/drm/panfrost/panfrost_drv.c

@@ -220,15 +220,8 @@ panfrost_copy_in_sync(struct drm_device *dev,
 	}
 
 	for (i = 0; i < in_fence_count; i++) {
-		struct dma_fence *fence;
-
-		ret = drm_syncobj_find_fence(file_priv, handles[i], 0, 0,
-					     &fence);
-		if (ret)
-			goto fail;
-
-		ret = drm_sched_job_add_dependency(&job->base, fence);
-
+		ret = drm_sched_job_add_syncobj_dependency(&job->base, file_priv,
+							   handles[i], 0);
 		if (ret)
 			goto fail;
 	}