ARM: tegra: nyan: Set maximum frequency for SPI flash

Otherwise the SPI core will refuse to register the device.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra124-nyan.dtsi

@@ -344,6 +344,7 @@ spi@0,7000da00 {
 
 		flash@0 {
 			compatible = "winbond,w25q32dw";
+			spi-max-frequency = <25000000>;
 			reg = <0>;
 		};
 	};