Add sentinel entry to dt array

Change-Id: Ic5d98c108593a16034c7dbc18043bbee13c31833
diff --git a/remoteproc/ethosu_remoteproc.c b/remoteproc/ethosu_remoteproc.c
index 0418ef4..3b45071 100644
--- a/remoteproc/ethosu_remoteproc.c
+++ b/remoteproc/ethosu_remoteproc.c
@@ -260,6 +260,7 @@
 
 static const struct of_device_id ethosu_rproc_match[] = {
 	{ .compatible = "arm,ethosu-rproc" },
+	{ /* sentinel */ },
 };
 
 static int ethosu_rproc_probe(struct platform_device *pdev)