arm64: dts: rockchip: Add vcc-supply to SPI flash on Pinephone Pro

As documented in the PinephonePro-Schematic-V1.0-20211127.pdf,
page 11, the SPI Flash's VCC pin is connected to VCC_1V8 power
source. This fixes the following warning:

  spi-nor spi1.0: supply vcc not found, using dummy regulator

Signed-off-by: Peter Robinson <[email protected]>
Reviewed-by: Ondřej Jirman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Stuebner <[email protected]>

Author: nullr0ute

arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts

@@ -754,6 +754,7 @@
 		compatible = "jedec,spi-nor";
 		reg = <0>;
 		spi-max-frequency = <10000000>;
+		vcc-supply = <&vcc_1v8>;
 	};
 };