feat(stm32mp2-fdts): add fw-config files for STM32MP257F-EV1

Add the Firmware Config DT file for STM32MP257F-EV1 board.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I895ef919b1f388be1e8d25490f25b1e7195984f8
diff --git a/fdts/stm32mp257f-ev1-fw-config.dts b/fdts/stm32mp257f-ev1-fw-config.dts
new file mode 100644
index 0000000..9424f49
--- /dev/null
+++ b/fdts/stm32mp257f-ev1-fw-config.dts
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+/*
+ * Copyright (c) 2024, STMicroelectronics - All Rights Reserved
+ */
+
+#include "stm32mp25-fw-config.dtsi"
+#include "stm32mp257f-ev1-ca35tdcid-fw-config.dtsi"