ARM: dts: stm32: enable timer trigger 6 on stm32mp157c-ed1

Enable timer 6 on stm32mp157c-ed1 that can serve as trigger for
ADC for instance.
Signed-off-by: NFabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: NAlexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157c-ed1.dts

@@ -25,6 +25,13 @@
 	};
 };
 
+&timers6 {
+	status = "okay";
+	timer@5 {
+		status = "okay";
+	};
+};
+
 &uart4 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart4_pins_a>;