refactor(st): use dashes for BSEC node names

This is something commonly asked by Linux kernel DT maintainers [1].
The mentioned doc is not upstreamed, but may be checked with dtbs_check.
While at it align some nodes with Linux or OP-TEE.

[1] https://lore.kernel.org/linux-arm-kernel/20231125184422.12315-1-krzysztof.kozlowski@linaro.org/

Change-Id: I63e983c2a00eda3cd8b81c66c0cd1a97cf8249b7
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/fdts/stm32mp15xx-dhcom-som.dtsi b/fdts/stm32mp15xx-dhcom-som.dtsi
index 7737a44..5138868 100644
--- a/fdts/stm32mp15xx-dhcom-som.dtsi
+++ b/fdts/stm32mp15xx-dhcom-som.dtsi
@@ -2,7 +2,7 @@
 /*
  * Copyright (C) 2019-2020 Marek Vasut <marex@denx.de>
  * Copyright (C) 2022 DH electronics GmbH
- * Copyright (C) 2023, STMicroelectronics - All Rights Reserved
+ * Copyright (C) 2023-2024, STMicroelectronics - All Rights Reserved
  */
 
 #include "stm32mp15-pinctrl.dtsi"
@@ -18,7 +18,7 @@
 };
 
 &bsec {
-	board_id: board_id@ec {
+	board_id: board-id@ec {
 		reg = <0xec 0x4>;
 		st,non-secure-otp;
 	};