arm64: dts: rockchip: add SFC support for Radxa ROCK 5B

This commit adds support for SPI NOR flash on Radxa ROCK 5B.

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/20240623023329.1044-1-naoki@radxa.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts

@@ -448,6 +448,20 @@ &sdio {
 	status = "okay";
 };
 
+&sfc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&fspim2_pins>;
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <104000000>;
+		spi-rx-bus-width = <4>;
+		spi-tx-bus-width = <1>;
+	};
+};
+
 &uart6 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart6m1_xfer &uart6m1_ctsn &uart6m1_rtsn>;