arm64: dts: rockchip: change spi-max-frequency for Radxa ROCK 3C

SPI NOR flash chip may vary, so use safe(lowest) spi-max-frequency.
Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
Link: https://lore.kernel.org/r/20240623023329.1044-3-naoki@radxa.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3566-rock-3c.dts

@@ -633,7 +633,7 @@ &sfc {
 	flash@0 {
 		compatible = "jedec,spi-nor";
 		reg = <0x0>;
-		spi-max-frequency = <120000000>;
+		spi-max-frequency = <104000000>;
 		spi-rx-bus-width = <4>;
 		spi-tx-bus-width = <1>;
 	};