ARM: dts: stm32: add cec support on stm32mp157c-ev1

This patch enables cec node on stm32mp157c-ev1 board
Signed-off-by: Yannick Fertre <yannick.fertre@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157c-ev1.dts

@@ -20,6 +20,12 @@ aliases {
 	};
 };
 
+&cec {
+	pinctrl-names = "default";
+	pinctrl-0 = <&cec_pins_a>;
+	status = "okay";
+};
+
 &i2c2 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2c2_pins_a>;