arm64: dts: rockchip: Add vcc supply to spi flash on rk3399-roc-pc

Add vcc supply to the spi-nor flash chip on rk3399-roc-pc boards
according to the board schematics ROC-3399-PC-V10-A-20180804 to avoid
warnings in dmesg output.

Signed-off-by: Markus Reichl <m.reichl@fivetechno.de>
Link: https://lore.kernel.org/r/20250411140223.1069-1-m.reichl@fivetechno.de


Signed-off-by: Heiko Stuebner <heiko@sntech.de>