ARM: dts: stm32: add power supply of rm68200 on stm32mp157c-ev1

This patch adds a new property (power-supply) to panel rm68200 (raydium)
on stm32mp157c-ev1.
Signed-off-by: Yannick Fertré <yannick.fertre@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

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

@@ -127,6 +127,7 @@ panel-dsi@0 {
 		reg = <0>;
 		reset-gpios = <&gpiof 15 GPIO_ACTIVE_LOW>;
 		backlight = <&panel_backlight>;
+		power-supply = <&v3v3>;
 		status = "okay";
 
 		port {