arm64: dts: allwinner: sun50i: h5: Add spi flash node for OrangePi PC2

The OrangePi PC2 have an mx25l1606e spi flash.
Add a node for it.
Signed-off-by: NEmmanuel Vadot <manu@freebsd.org>
Signed-off-by: NMaxime Ripard <maxime.ripard@bootlin.com>

arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-pc2.dts

@@ -207,6 +207,18 @@
 	status = "okay";
 };
 
+&spi0  {
+	status = "okay";
+
+	flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <40000000>;
+	};
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_pins_a>;