ARM: dts: rockchip: Enable SFC for edgeble-neu2

Enable on module SPI Flash present in Edgeble Neu2.

Tested-by: Jagan Teki <jagan@edgeble.ai>
Signed-off-by: Stephen Chen <stephen@radxa.com>
Link: https://lore.kernel.org/r/20230731103518.2906147-12-jagan@edgeble.ai


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