ARM: dts: stm32: add power supply of otm8009a on stm32mp157c-dk2

This patch adds a new property (power-supply) to panel otm8009a (orisetech)
on stm32mp157c-dk2  & regulator v3v3.
Signed-off-by: Yannick Fertré <yannick.fertre@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157c-dk2.dts

@@ -50,6 +50,7 @@ panel@0 {
 		compatible = "orisetech,otm8009a";
 		reg = <0>;
 		reset-gpios = <&gpioe 4 GPIO_ACTIVE_LOW>;
+		power-supply = <&v3v3>;
 		status = "okay";
 
 		port {