fix(fdts stm32mp1): correct copyright dates

Add 2021 year in the file header Copyright line.

Change-Id: I09f7bef1f746c429ff308286169354e58648a1cd
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/fdts/stm32mp157c-lxa-mc1.dts b/fdts/stm32mp157c-lxa-mc1.dts
index 31f1382..6f67712 100644
--- a/fdts/stm32mp157c-lxa-mc1.dts
+++ b/fdts/stm32mp157c-lxa-mc1.dts
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-3-Clause) */
 /*
- * Copyright (C) 2020 STMicroelectronics - All Rights Reserved
+ * Copyright (c) 2020-2021, STMicroelectronics - All Rights Reserved
  * Copyright (C) 2020 Ahmad Fatoum, Pengutronix
  */