drm/etnaviv: remove stale TODO in etnaviv_gpu_submit

Flush and prefetch are properly handled in the buffer code, data endianess
would need much wider changes than adding something to this single function.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

@@ -1390,15 +1390,6 @@ int etnaviv_gpu_submit(struct etnaviv_gpu *gpu,
 	if (ret < 0)
 		return ret;
 
-	/*
-	 * TODO
-	 *
-	 * - flush
-	 * - data endian
-	 * - prefetch
-	 *
-	 */
-
 	/*
 	 * if there are performance monitor requests we need to have
 	 * - a sync point to re-configure gpu and process ETNA_PM_PROCESS_PRE