feat(stm32mp2-fdts): add clock tree for STM32MP257F-EV1

Add dedicated RCC file to define clock tree and include it in
STM32MP257F-EV1 board DT file.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I259075f34d02534063c95fb571aec6ada480ce5f
diff --git a/fdts/stm32mp257f-ev1.dts b/fdts/stm32mp257f-ev1.dts
index 88cefa0..6df1b30 100644
--- a/fdts/stm32mp257f-ev1.dts
+++ b/fdts/stm32mp257f-ev1.dts
@@ -6,8 +6,10 @@
 
 /dts-v1/;
 
+#include <dt-bindings/clock/stm32mp25-clksrc.h>
 #include "stm32mp257.dtsi"
 #include "stm32mp25xf.dtsi"
+#include "stm32mp257f-ev1-ca35tdcid-rcc.dtsi"
 #include "stm32mp25-pinctrl.dtsi"
 #include "stm32mp25xxai-pinctrl.dtsi"