test: dm: regmap: fix license header

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/test/dm/regmap.c b/test/dm/regmap.c
index 50af220..f83a821 100644
--- a/test/dm/regmap.c
+++ b/test/dm/regmap.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2015 Google, Inc
-2 *
+ *
  * SPDX-License-Identifier:	GPL-2.0+
  */